ejabberd.yml

package: ejabberd

title: ejabberd.yml(5)

summary: main configuration file for ejabberd.

text:
# ejabberd.yml(5)

## NAME
ejabberd.yml - main configuration file for ejabberd.

## SYNOPSIS
ejabberd.yml

## DESCRIPTION
The configuration file is written in YAML language.

Warning YAML is indentation sensitive, so make sure you respect indentation, or otherwise you will get pretty cryptic configuration errors.

Logically, configuration options are splitted into 3 main categories: Modules, Listeners and everything else called Top Level options. Thus this document is splitted into 3 main chapters describing each category separately. So, the contents of ejabberd.yml will typically look like this:

```
hosts:

  - example.com

  - domain.tld
loglevel: info
...
listen:

  -

    port: 5222

    module: ejabberd_c2s

  ...
modules:

  mod_roster: {}

  ...
```

Any configuration error (such as syntax error, unknown option or invalid option value) is fatal in the sense that ejabberd will refuse to load the whole configuration file and will not start or will abort configuration reload.

All options can be changed in runtime by running ejabberdctl reload-config command. Configuration reload is atomic: either all options are accepted and applied simultaneously or the new configuration is refused without any impact on currently running configuration.

Some options can be specified for particular virtual host(s) only using host_config or append_host_config options. Such options are called local. Examples are modules, auth_method and default_db. The options that cannot be defined per virtual host are called global. Examples are loglevel, certfiles and listen. It is a configuration mistake to put global options under host_config or append_host_config section - ejabberd will refuse to load such configuration.

It is not recommended to write ejabberd.yml from scratch. Instead it is better to start from "default" configuration file available at https://github.com/processone/ejabberd/blob/21.12/ejabberd.yml.example. Once you get ejabberd running you can start changing configuration options to meet your requirements.

Note that this document is intended to provide comprehensive description of all configuration options that can be consulted to understand the meaning of a particular option, its format and possible values. It will be quite hard to understand how to configure ejabberd by reading this document only - for this purpose the reader is recommended to read online Configuration Guide available at https://docs.ejabberd.im/admin/configuration.

## TOP LEVEL OPTIONS
This section describes top level options of ejabberd.

access_rules: {AccessName: {allow|deny: ACLRules|ACLName}}

The option specifies access rules. Each access rule is assigned a name that can be referenced from other parts of the configuration file (mostly from access options of ejabberd modules). Each rule definition may contain arbitrary number of allow or deny sections, and each section may contain any number of ACL rules (see acl option). There are no access rules defined by default. Example:

```
access_rules:

  configure:

    allow: admin

  something:

    deny: someone

    allow: all

  s2s_banned:

    deny: problematic_hosts

    deny: banned_forever

    deny:

      ip: 222.111.222.111/32

    deny:

      ip: 111.222.111.222/32

    allow: all

  xmlrpc_access:

    allow:

      user: peter@example.com

    allow:

      user: ivone@example.com

    allow:

      user: bot@example.com

      ip: 10.0.0.0/24
```

acl: {ACLName: {ACLType: ACLValue}}

The option defines access control lists: named sets of rules which are used to match against different targets (such as a JID or an IP address). Every set of rules has name ACLName: it can be any string except all or none (those are predefined names for the rules that match all or nothing respectively). The name ACLName can be referenced from other parts of the configuration file, for example in access_rules option. The rules of ACLName are represented by mapping {ACLType: ACLValue}. These can be one of the following: ip: Network

The rule matches any IP address from the Network.

node_glob: Pattern

Same as node_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

node_regexp: user_regexp@server_regexp

The rule matches any JID with node part matching regular expression user_regexp and server part matching regular expression server_regexp.

resource: Resource

The rule matches any JID with a resource Resource.

resource_glob: Pattern

Same as resource_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

resource_regexp: Regexp

The rule matches any JID with a resource that matches regular expression Regexp.

server: Server

The rule matches any JID from server Server. The value of Server must be a valid hostname or an IP address.

server_glob: Pattern

Same as server_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

server_regexp: Regexp

The rule matches any JID from the server that matches regular expression Regexp.

user: Username

If Username is in the form of "user@server", the rule matches a JID against this value. Otherwise, if Username is in the form of "user", the rule matches any JID that has Username in the node part as long as the server part of this JID is any virtual host served by ejabberd.

user_glob: Pattern

Same as user_regexp, but matching is performed on a specified Pattern according to the rules used by the Unix shell.

user_regexp: Regexp

If Regexp is in the form of "regexp@server", the rule matches any JID with node part matching regular expression "regexp" as long as the server part of this JID is equal to "server". If Regexp is in the form of "regexp", the rule matches any JID with node part matching regular expression "regexp" as long as the server part of this JID is any virtual host served by ejabberd.

acme: Options

ACME configuration, to automatically obtain SSL certificates for the domains served by ejabberd, which means that certificate requests and renewals are performed to some CA server (aka "ACME server") in a fully automated mode. The Options are: auto: true | false

Whether to automatically request certificates for all configured domains (that yet have no a certificate) on server start or configuration reload. The default is true.

ca_url: URL

The ACME directory URL used as an entry point for the ACME server. The default value is https://acme-v02.api.letsencrypt.org/directory - the directory URL of Let’s Encrypt authority.

cert_type: rsa | ec

A type of a certificate key. Available values are ec and rsa for EC and RSA certificates respectively. It’s better to have RSA certificates for the purpose of backward compatibility with legacy clients and servers, thus the default is rsa.

contact: [Contact, ...]

A list of contact addresses (typically emails) where an ACME server will send notifications when problems occur. The value of Contact must be in the form of "scheme:address" (e.g. "mailto:user@domain.tld"). The default is an empty list which means an ACME server will send no notices.

Example:

```
acme:

  ca_url: https://acme-v02.api.letsencrypt.org/directory

  contact:

    - mailto:admin@domain.tld

    - mailto:bot@domain.tld

  auto: true

  cert_type: rsa
```

allow_contrib_modules: true | false

Whether to allow installation of third-party modules or not. The default value is true.

allow_multiple_connections: true | false

This option is only used when the anonymous mode is enabled. Setting it to true means that the same username can be taken multiple times in anonymous login mode if different resource are used to connect. This option is only useful in very special occasions. The default value is false.

anonymous_protocol: login_anon | sasl_anon | both

Define what anonymous protocol will be used:

•login_anon means that the anonymous login method will be used.

•sasl_anon means that the SASL Anonymous method will be used.

•both means that SASL Anonymous and login anonymous are both enabled.

The default value is sasl_anon.

api_permissions: [Permission, ...]

Define the permissions for API access. Please consult the ejabberd Docs web → For Developers → ejabberd ReST API → API Permissions.

append_host_config: {Host: Options}

To define specific ejabberd modules in a virtual host, you can define the global modules option with the common modules, and later add specific modules to certain virtual hosts. To accomplish that, append_host_config option can be used.

auth_cache_life_time: timeout()

Same as cache_life_time, but applied to authentication cache only. If not set, the value from cache_life_time will be used.

auth_cache_missed: true | false

Same as cache_missed, but applied to authentication cache only. If not set, the value from cache_missed will be used.

auth_cache_size: pos_integer() | infinity

Same as cache_size, but applied to authentication cache only. If not set, the value from cache_size will be used.

auth_method: [mnesia | sql | anonymous | external | jwt | ldap | pam, ...]

A list of authentication methods to use. If several methods are defined, authentication is considered successful as long as authentication of at least one of the methods succeeds. The default value is [mnesia].

auth_opts: [Option, ...]

This is used by the contributed module ejabberd_auth_http that can be installed from the ejabberd-contrib Git repository. Please refer to that module’s README file for details.

Note about the next option: improved in 20.01:

auth_password_format: plain | scram

The option defines in what format the users passwords are stored:

•plain: The password is stored as plain text in the database. This is risky because the passwords can be read if your database gets compromised. This is the default value. This format allows clients to authenticate using: the old Jabber Non-SASL (XEP-0078), SASL PLAIN, SASL DIGEST-MD5, and SASL SCRAM-SHA-1.

•scram: The password is not stored, only some information that allows to verify the hash provided by the client. It is impossible to obtain the original plain password from the stored information; for this reason, when this value is configured it cannot be changed to plain anymore. This format allows clients to authenticate using: SASL PLAIN and SASL SCRAM-SHA-1. The default value is plain.

auth_scram_hash: sha | sha256 | sha512

Hash algorith that should be used to store password in SCRAM format. You shouldn’t change this if you already have passwords generated with a different algorithm - users that have such passwords will not be able to authenticate. The default value is sha.

auth_use_cache: true | false

Same as use_cache, but applied to authentication cache only. If not set, the value from use_cache will be used.

c2s_cafile: Path

Full path to a file containing one or more CA certificates in PEM format. All client certificates should be signed by one of these root CA certificates and should contain the corresponding JID(s) in subjectAltName field. There is no default value.

You can use host_config to specify this option per-vhost.

To set a specific file per listener, use the listener’s cafile option. Please notice that c2s_cafile overrides the listener’s cafile option.

c2s_ciphers: [Cipher, ...]

A list of OpenSSL ciphers to use for c2s connections. The default value is shown in the example below: Example:

```
c2s_ciphers:

  - HIGH

  - "!aNULL"

  - "!eNULL"

  - "!3DES"

  - "@STRENGTH"
```

c2s_dhfile: Path

Full path to a file containing custom DH parameters to use for c2s connections. Such a file could be created with the command "openssl dhparam -out dh.pem 2048". If this option is not specified, 2048-bit MODP Group with 256-bit Prime Order Subgroup will be used as defined in RFC5114 Section 2.3.

c2s_protocol_options: [Option, ...]

List of general SSL options to use for c2s connections. These map to OpenSSL’s set_options(). The default value is shown in the example below: Example:

```
c2s_protocol_options:

  - no_sslv3

  - cipher_server_preference

  - no_compression
```

c2s_tls_compression: true | false

Whether to enable or disable TLS compression for c2s connections. The default value is false.

ca_file: Path

Path to a file of CA root certificates. The default is to use system defined file if possible.

For server conections, this ca_file option is overriden by the s2s_cafile option.

cache_life_time: timeout()

The time of a cached item to keep in cache. Once it’s expired, the corresponding item is erased from cache. The default value is 1 hour. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_cache_life_time, oauth_cache_life_time, router_cache_life_time, and sm_cache_life_time.

cache_missed: true | false

Whether or not to cache missed lookups. When there is an attempt to lookup for a value in a database and this value is not found and the option is set to true, this attempt will be cached and no attempts will be performed until the cache expires (see cache_life_time). Usually you don’t want to change it. Default is true. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_cache_missed, oauth_cache_missed, router_cache_missed, and sm_cache_missed.

cache_size: pos_integer() | infinity

A maximum number of items (not memory!) in cache. The rule of thumb, for all tables except rosters, you should set it to the number of maximum online users you expect. For roster multiply this number by 20 or so. If the cache size reaches this threshold, it’s fully cleared, i.e. all items are deleted, and the corresponding warning is logged. You should avoid frequent cache clearance, because this degrades performance. The default value is 1000. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_cache_size, oauth_cache_size, router_cache_size, and sm_cache_size.

captcha_cmd: Path

Full path to a script that generates CAPTCHA images. There is no default value: when this option is not set, CAPTCHA functionality is completely disabled.

captcha_host: String

Deprecated. Use captcha_url instead.

captcha_limit: pos_integer() | infinity

Maximum number of CAPTCHA generated images per minute for any given JID. The option is intended to protect the server from CAPTCHA DoS. The default value is infinity.

captcha_url: URL

An URL where CAPTCHA requests should be sent. NOTE: you need to configure request_handlers for ejabberd_http listener as well. There is no default value.

certfiles: [Path, ...]

The option accepts a list of file paths (optionally with wildcards) containing either PEM certificates or PEM private keys. At startup or configuration reload, ejabberd reads all certificates from these files, sorts them, removes duplicates, finds matching private keys and then rebuilds full certificate chains for the use in TLS connections. Use this option when TLS is enabled in either of ejabberd listeners: ejabberd_c2s, ejabberd_http and so on. NOTE: if you modify the certificate files or change the value of the option, run ejabberdctl reload-config in order to rebuild and reload the certificate chains. If you use Let’s Encrypt certificates for your domain "domain.tld", the configuration will look like this:

```
certfiles:

  - /etc/letsencrypt/live/domain.tld/fullchain.pem

  - /etc/letsencrypt/live/domain.tld/privkey.pem
```

cluster_backend: Backend

A database backend to use for storing information about cluster. The only available value so far is mnesia.

cluster_nodes: [Node, ...]

A list of Erlang nodes to connect on ejabberd startup. This option is mostly intended for ejabberd customization and sophisticated setups. The default value is an empty list.

default_db: mnesia | sql

Default persistent storage for ejabberd. Modules and other components (e.g. authentication) may have its own value. The default value is mnesia.

default_ram_db: mnesia | redis | sql

Default volatile (in-memory) storage for ejabberd. Modules and other components (e.g. session management) may have its own value. The default value is mnesia.

define_macro: {MacroName: MacroValue}

Defines a macro. The value can be any valid arbitrary YAML value. For convenience, it’s recommended to define a MacroName in capital letters. Duplicated macros are not allowed. Macros are processed after additional configuration files have been included, so it is possible to use macros that are defined in configuration files included before the usage. It is possible to use a MacroValue in the definition of another macro. Example:

```
define_macro:

  DEBUG: debug

  LOG_LEVEL: DEBUG

  USERBOB:

    user: bob@localhost
loglevel: LOG_LEVEL
acl:

  admin: USERBOB
```

disable_sasl_mechanisms: [Mechanism, ...]

Specify a list of SASL mechanisms (such as DIGEST-MD5 or SCRAM-SHA1) that should not be offered to the client. For convenience, the value of Mechanism is case-insensitive. The default value is an empty list, i.e. no mechanisms are disabled by default.

domain_balancing: {Domain: Options}

An algorithm to load balance the components that are plugged on an ejabberd cluster. It means that you can plug one or several instances of the same component on each ejabberd node and that the traffic will be automatically distributed. The algorithm to deliver messages to the component(s) can be specified by this option. For any component connected as Domain, available Options are: component_number: 2..1000

The number of components to balance.

type: random | source | destination | bare_source | bare_destination

How to deliver stanzas to connected components: random - an instance is chosen at random; destination - an instance is chosen by the full JID of the packet’s to attribute; source - by the full JID of the packet’s from attribute; bare_destination - by the the bare JID (without resource) of the packet’s to attribute; bare_source - by the bare JID (without resource) of the packet’s from attribute is used. The default value is random.

Example:

```
domain_balancing:

  component.domain.tld:

    type: destination

    component_number: 5

  transport.example.org:

    type: bare_source
```

ext_api_headers: Headers

String of headers (separated with commas ,) that will be provided by ejabberd when sending ReST requests. The default value is an empty string of headers: "".

ext_api_http_pool_size: pos_integer()

Define the size of the HTTP pool, that is, the maximum number of sessions that the ejabberd ReST service will handle simultaneously. The default value is: 100.

ext_api_path_oauth: Path

Define the base URI path when performing OAUTH ReST requests. The default value is: "/oauth".

ext_api_url: URL

Define the base URI when performing ReST requests. The default value is: "http://localhost/api".

extauth_pool_name: Name

Define the pool name appendix, so the full pool name will be extauth_pool_Name. The default value is the hostname.

extauth_pool_size: Size

The option defines the number of instances of the same external program to start for better load balancing. The default is the number of available CPU cores.

extauth_program: Path

Indicate in this option the full path to the external authentication script. The script must be executable by ejabberd.

fqdn: Domain

A fully qualified domain name that will be used in SASL DIGEST-MD5 authentication. The default is detected automatically.

hide_sensitive_log_data: true | false

A privacy option to not log sensitive data (mostly IP addresses). The default value is false for backward compatibility.

host_config: {Host: Options}

The option is used to redefine Options for virtual host Host. In the example below LDAP authentication method will be used on virtual host domain.tld and SQL method will be used on virtual host example.org. Example:

```
hosts:

  - domain.tld

  - example.org
auth_method:

  - sql
host_config:

  domain.tld:

    auth_method:

      - ldap
```

hosts: [Domain1, Domain2, ...]

The option defines a list containing one or more domains that ejabberd will serve. This is a mandatory option.

include_config_file: [Filename, ...] | {Filename: Options}

Read additional configuration from Filename. If the value is provided in {Filename: Options} format, the Options must be one of the following: allow_only: [OptionName, ...]

Allows only the usage of those options in the included file Filename. The options that do not match this criteria are not accepted. The default value is to include all options.

disallow: [OptionName, ...]

Disallows the usage of those options in the included file Filename. The options that match this criteria are not accepted. The default value is an empty list.

jwt_auth_only_rule: AccessName

This ACL rule defines accounts that can use only this auth method, even if others are also defined in the ejabberd configuration file. In other words: if there are several auth methods enabled for this host (JWT, SQL, ...), users that match this rule can only use JWT. The default value is none.

jwt_jid_field: FieldName

By default, the JID is defined in the "jid" JWT field. This option allows to specify other JWT field name where the JID is defined.

jwt_key: FilePath

Path to the file that contains the JWK Key. The default value is undefined.

language: Language

The option defines the default language of server strings that can be seen by XMPP clients. If an XMPP client does not possess xml:lang attribute, the specified language is used. The default value is "en".

ldap_backups: [Host, ...]

A list of IP addresses or DNS names of LDAP backup servers. When no servers listed in ldap_servers option are reachable, ejabberd will try to connect to these backup servers. The default is an empty list, i.e. no backup servers specified. WARNING: ejabberd doesn’t try to reconnect back to the main servers when they become operational again, so the only way to restore these connections is to restart ejabberd. This limitation might be fixed in future releases.

ldap_base: Base

LDAP base directory which stores users accounts. There is no default value: you must set the option in order for LDAP connections to work properly.

ldap_deref_aliases: never | always | finding | searching

Whether to dereference aliases or not. The default value is never.

ldap_dn_filter: {Filter: FilterAttrs}

This filter is applied on the results returned by the main filter. The filter performs an additional LDAP lookup to make the complete result. This is useful when you are unable to define all filter rules in ldap_filter. You can define "%u", "%d", "%s" and "%D" pattern variables in Filter: "%u" is replaced by a user’s part of the JID, "%d" is replaced by the corresponding domain (virtual host), all "%s" variables are consecutively replaced by values from the attributes in FilterAttrs and "%D" is replaced by Distinguished Name from the result set. There is no default value, which means the result is not filtered. WARNING: Since this filter makes additional LDAP lookups, use it only as the last resort: try to define all filter rules in ldap_filter option if possible. Example:

```
ldap_dn_filter:

  "(&(name=%s)(owner=%D)(user=%u@%d))": [sn]
```

ldap_encrypt: tls | none

Whether to encrypt LDAP connection using TLS or not. The default value is none. NOTE: STARTTLS encryption is not supported.

ldap_filter: Filter

An LDAP filter as defined in RFC4515. There is no default value. Example: "(&(objectClass=shadowAccount)(memberOf=XMPP Users))". NOTE: don’t forget to close brackets and don’t use superfluous whitespaces. Also you must not use "uid" attribute in the filter because this attribute will be appended to the filter automatically.

ldap_password: Password

Bind password. The default value is an empty string.

ldap_port: 1..65535

Port to connect to your LDAP server. The default port is 389 if encryption is disabled and 636 if encryption is enabled.

ldap_rootdn: RootDN

Bind Distinguished Name. The default value is an empty string, which means "anonymous connection".

ldap_servers: [Host, ...]

A list of IP addresses or DNS names of your LDAP servers. The default value is [localhost].

ldap_tls_cacertfile: Path

A path to a file containing PEM encoded CA certificates. This option is required when TLS verification is enabled.

ldap_tls_certfile: Path

A path to a file containing PEM encoded certificate along with PEM encoded private key. This certificate will be provided by ejabberd when TLS enabled for LDAP connections. There is no default value, which means no client certificate will be sent.

ldap_tls_depth: Number

Specifies the maximum verification depth when TLS verification is enabled, i.e. how far in a chain of certificates the verification process can proceed before the verification is considered to be failed. Peer certificate = 0, CA certificate = 1, higher level CA certificate = 2, etc. The value 2 thus means that a chain can at most contain peer cert, CA cert, next CA cert, and an additional CA cert. The default value is 1.

ldap_tls_verify: false | soft | hard

This option specifies whether to verify LDAP server certificate or not when TLS is enabled. When hard is set, ejabberd doesn’t proceed if the certificate is invalid. When soft is set, ejabberd proceeds even if the check has failed. The default is false, which means no checks are performed.

ldap_uids: [Attr] | {Attr: AttrFormat}

LDAP attributes which hold a list of attributes to use as alternatives for getting the JID, where Attr is an LDAP attribute which holds the user’s part of the JID and AttrFormat must contain one and only one pattern variable "%u" which will be replaced by the user’s part of the JID. For example, "%u@example.org". If the value is in the form of [Attr] then AttrFormat is assumed to be "%u".

listen: [Options, ...]

The option for listeners configuration. See the Listen Modules section for details.

log_rotate_count: Number

The number of rotated log files to keep. The default value is 1, which means that only keeps ejabberd.log.0, error.log.0 and crash.log.0.

log_rotate_size: pos_integer() | infinity

The size (in bytes) of a log file to trigger rotation. If set to infinity, log rotation is disabled. The default value is 10485760 (that is, 10 Mb).

loglevel: none | emergency | alert | critical | error | warning | notice | info | debug

Verbosity of log files generated by ejabberd. The default value is info. NOTE: previous versions of ejabberd had log levels defined in numeric format (0..5). The numeric values are still accepted for backward compatibility, but are not recommended.

max_fsm_queue: Size

This option specifies the maximum number of elements in the queue of the FSM (Finite State Machine). Roughly speaking, each message in such queues represents one XML stanza queued to be sent into its relevant outgoing stream. If queue size reaches the limit (because, for example, the receiver of stanzas is too slow), the FSM and the corresponding connection (if any) will be terminated and error message will be logged. The reasonable value for this option depends on your hardware configuration. The allowed values are positive integers. The default value is 10000.

modules: {Module: Options}

The option for modules configuration. See Modules section for details.

negotiation_timeout: timeout()

Time to wait for an XMPP stream negotiation to complete. When timeout occurs, the corresponding XMPP stream is closed. The default value is 30 seconds.

net_ticktime: timeout()

This option can be used to tune tick time parameter of net_kernel. It tells Erlang VM how often nodes should check if intra-node communication was not interrupted. This option must have identical value on all nodes, or it will lead to subtle bugs. Usually leaving default value of this is option is best, tweak it only if you know what you are doing. The default value is 1 minute.

new_sql_schema: true | false

Whether to use new SQL schema. All schemas are located at https://github.com/processone/ejabberd/tree/21.12/sql. There are two schemas available. The default legacy schema allows to store one XMPP domain into one ejabberd database. The new schema allows to handle several XMPP domains in a single ejabberd database. Using this new schema is best when serving several XMPP domains and/or changing domains from time to time. This avoid need to manage several databases and handle complex configuration changes. The default depends on configuration flag --enable-new-sql-schema which is set at compile time.

oauth_access: AccessName

By default creating OAuth tokens is not allowed. To define which users can create OAuth tokens, you can refer to an ejabberd access rule in the oauth_access option. Use all to allow everyone to create tokens.

oauth_cache_life_time: timeout()

Same as cache_life_time, but applied to OAuth cache only. If not set, the value from cache_life_time will be used.

oauth_cache_missed: true | false

Same as cache_missed, but applied to OAuth cache only. If not set, the value from cache_missed will be used.

Note about the next option: added in 21.01:

oauth_cache_rest_failure_life_time: timeout()

The time that a failure in OAuth ReST is cached. The default value is infinity.

oauth_cache_size: pos_integer() | infinity

Same as cache_size, but applied to OAuth cache only. If not set, the value from cache_size will be used.

oauth_client_id_check: allow | db | deny

Define whether the client authentication is always allowed, denied, or it will depend if the client ID is present in the database. The default value is allow.

oauth_db_type: mnesia | sql

Database backend to use for OAuth authentication. The default value is picked from default_db option, or if it’s not set, mnesia will be used.

oauth_expire: timeout()

Time during which the OAuth token is valid, in seconds. After that amount of time, the token expires and the delegated credential cannot be used and is removed from the database. The default is 4294967 seconds.

oauth_use_cache: true | false

Same as use_cache, but applied to OAuth cache only. If not set, the value from use_cache will be used.

oom_killer: true | false

Enable or disable OOM (out-of-memory) killer. When system memory raises above the limit defined in oom_watermark option, ejabberd triggers OOM killer to terminate most memory consuming Erlang processes. Note that in order to maintain functionality, ejabberd only attempts to kill transient processes, such as those managing client sessions, s2s or database connections. The default value is true.

oom_queue: Size

Trigger OOM killer when some of the running Erlang processes have messages queue above this Size. Note that such processes won’t be killed if oom_killer option is set to false or if oom_watermark is not reached yet.

oom_watermark: Percent

A percent of total system memory consumed at which OOM killer should be activated with some of the processes possibly be killed (see oom_killer option). Later, when memory drops below this Percent, OOM killer is deactivated. The default value is 80 percents.

outgoing_s2s_families: [ipv4 | ipv6, ...]

Specify which address families to try, in what order. The default is [ipv4, ipv6] which means it first tries connecting with IPv4, if that fails it tries using IPv6.

Note about the next option: added in 20.12:

outgoing_s2s_ipv4_address: Address

Specify the IPv4 address that will be used when establishing an outgoing S2S IPv4 connection, for example "127.0.0.1". The default value is undefined.

Note about the next option: added in 20.12:

outgoing_s2s_ipv6_address: Address

Specify the IPv6 address that will be used when establishing an outgoing S2S IPv6 connection, for example "::FFFF:127.0.0.1". The default value is undefined.

outgoing_s2s_port: 1..65535

A port number to use for outgoing s2s connections when the target server doesn’t have an SRV record. The default value is 5269.

outgoing_s2s_timeout: timeout()

The timeout in seconds for outgoing S2S connection attempts. The default value is 10 seconds.

pam_service: Name

This option defines the PAM service name. Refer to the PAM documentation of your operation system for more information. The default value is ejabberd.

pam_userinfotype: username | jid

This option defines what type of information about the user ejabberd provides to the PAM service: only the username, or the user’s JID. Default is username.

pgsql_users_number_estimate: true | false

Whether to use PostgreSQL estimation when counting registered users. The default value is false.

queue_dir: Directory

If queue_type option is set to file, use this Directory to store file queues. The default is to keep queues inside Mnesia directory.

queue_type: ram | file

Default type of queues in ejabberd. Modules may have its own value of the option. The value of ram means that queues will be kept in memory. If value file is set, you may also specify directory in queue_dir option where file queues will be placed. The default value is ram.

redis_connect_timeout: timeout()

A timeout to wait for the connection to be re-established to the Redis server. The default is 1 second.

redis_db: Number

Redis database number. The default is 0.

redis_password: Password

The password to the Redis server. The default is an empty string, i.e. no password.

redis_pool_size: Number

The number of simultaneous connections to the Redis server. The default value is 10.

redis_port: 1..65535

The port where the Redis server is accepting connections. The default is 6379.

redis_queue_type: ram | file

The type of request queue for the Redis server. See description of queue_type option for the explanation. The default value is the value defined in queue_type or ram if the latter is not set.

redis_server: Hostname

A hostname or an IP address of the Redis server. The default is localhost.

registration_timeout: timeout()

This is a global option for module mod_register. It limits the frequency of registrations from a given IP or username. So, a user that tries to register a new account from the same IP address or JID during this time after their previous registration will receive an error with the corresponding explanation. To disable this limitation, set the value to infinity. The default value is 600 seconds.

resource_conflict: setresource | closeold | closenew

NOTE: this option is deprecated and may be removed anytime in the future versions. The possible values match exactly the three possibilities described in XMPP Core: section 7.7.2.2. The default value is closeold. If the client uses old Jabber Non-SASL authentication (XEP-0078), then this option is not respected, and the action performed is closeold.

router_cache_life_time: timeout()

Same as cache_life_time, but applied to routing table cache only. If not set, the value from cache_life_time will be used.

router_cache_missed: true | false

Same as cache_missed, but applied to routing table cache only. If not set, the value from cache_missed will be used.

router_cache_size: pos_integer() | infinity

Same as cache_size, but applied to routing table cache only. If not set, the value from cache_size will be used.

router_db_type: mnesia | redis | sql

Database backend to use for routing information. The default value is picked from default_ram_db option, or if it’s not set, mnesia will be used.

router_use_cache: true | false

Same as use_cache, but applied to routing table cache only. If not set, the value from use_cache will be used.

rpc_timeout: timeout()

A timeout for remote function calls between nodes in an ejabberd cluster. You should probably never change this value since those calls are used for internal needs only. The default value is 5 seconds.

s2s_access: Access

The access rule to restrict server-to-server connections. The default value is all which means no restrictions are applied.

s2s_cafile: Path

A path to a file with CA root certificates that will be used to authenticate s2s connections. If not set, the value of ca_file will be used.

You can use host_config to specify this option per-vhost.

s2s_ciphers: [Cipher, ...]

A list of OpenSSL ciphers to use for s2s connections. The default value is shown in the example below: Example:

```
s2s_ciphers:

  - HIGH

  - "!aNULL"

  - "!eNULL"

  - "!3DES"

  - "@STRENGTH"
```

s2s_dhfile: Path

Full path to a file containing custom DH parameters to use for s2s connections. Such a file could be created with the command "openssl dhparam -out dh.pem 2048". If this option is not specified, 2048-bit MODP Group with 256-bit Prime Order Subgroup will be used as defined in RFC5114 Section 2.3.

s2s_dns_retries: Number

DNS resolving retries. The default value is 2.

s2s_dns_timeout: timeout()

The timeout for DNS resolving. The default value is 10 seconds.

s2s_max_retry_delay: timeout()

The maximum allowed delay for s2s connection retry to connect after a failed connection attempt. The default value is 300 seconds (5 minutes).

s2s_protocol_options: [Option, ...]

List of general SSL options to use for s2s connections. These map to OpenSSL’s set_options(). The default value is shown in the example below: Example:

```
s2s_protocol_options:

  - no_sslv3

  - cipher_server_preference

  - no_compression
```

s2s_queue_type: ram | file

The type of a queue for s2s packets. See description of queue_type option for the explanation. The default value is the value defined in queue_type or ram if the latter is not set.

s2s_timeout: timeout()

A time to wait before closing an idle s2s connection. The default value is 10 minutes.

s2s_tls_compression: true | false

Whether to enable or disable TLS compression for s2s connections. The default value is false.

s2s_use_starttls: true | false | optional | required

Whether to use STARTTLS for s2s connections. The value of false means STARTTLS is prohibited. The value of true or optional means STARTTLS is enabled but plain connections are still allowed. And the value of required means that only STARTTLS connections are allowed. The default value is false (for historical reasons).

s2s_zlib: true | false

Whether to use zlib compression (as defined in XEP-0138) or not. The default value is false. WARNING: this type of compression is nowadays considered insecure.

shaper: {ShaperName: Rate}

The option defines a set of shapers. Every shaper is assigned a name ShaperName that can be used in other parts of the configuration file, such as shaper_rules option. The shaper itself is defined by its Rate, where Rate stands for the maximum allowed incoming rate in bytes per second. When a connection exceeds this limit, ejabberd stops reading from the socket until the average rate is again below the allowed maximum. In the example below shaper normal limits the traffic speed to 1,000 bytes/sec and shaper fast limits the traffic speed to 50,000 bytes/sec: Example:

```
shaper:

  normal: 1000

  fast: 50000
```

shaper_rules: {ShaperRuleName: {Number|ShaperName: ACLRule|ACLName}}

An entry allowing to declaring shaper to use for matching user/hosts. Semantics is similar to access_rules option, the only difference is that instead using allow or deny, a name of a shaper (defined in shaper option) or a positive number should be used. Example:

```
shaper_rules:

  connections_limit:

    10:

      user: peter@example.com

    100: admin

    5: all

  download_speed:

    fast: admin

    slow: anonymous_users

    normal: all

  log_days: 30
```

sm_cache_life_time: timeout()

Same as cache_life_time, but applied to client sessions table cache only. If not set, the value from cache_life_time will be used.

sm_cache_missed: true | false

Same as cache_missed, but applied to client sessions table cache only. If not set, the value from cache_missed will be used.

sm_cache_size: pos_integer() | infinity

Same as cache_size, but applied to client sessions table cache only. If not set, the value from cache_size will be used.

sm_db_type: mnesia | redis | sql

Database backend to use for client sessions information. The default value is picked from default_ram_db option, or if it’s not set, mnesia will be used.

sm_use_cache: true | false

Same as use_cache, but applied to client sessions table cache only. If not set, the value from use_cache will be used.

sql_connect_timeout: timeout()

A time to wait for connection to an SQL server to be established. The default value is 5 seconds.

sql_database: Database

An SQL database name. For SQLite this must be a full path to a database file. The default value is ejabberd.

sql_keepalive_interval: timeout()

An interval to make a dummy SQL request to keep alive the connections to the database. There is no default value, so no keepalive requests are made.

Note about the next option: added in 20.12:

sql_odbc_driver: Path

Path to the ODBC driver to use to connect to a Microsoft SQL Server database. This option is only valid if the sql_type option is set to mssql. The default value is: libtdsodbc.so

sql_password: Password

The password for SQL authentication. The default is empty string.

sql_pool_size: Size

Number of connections to the SQL server that ejabberd will open for each virtual host. The default value is 10. WARNING: for SQLite this value is 1 by default and it’s not recommended to change it due to potential race conditions.

sql_port: 1..65535

The port where the SQL server is accepting connections. The default is 3306 for MySQL, 5432 for PostgreSQL and 1433 for MS SQL. The option has no effect for SQLite.

Note about the next option: added in 20.01:

sql_prepared_statements: true | false

This option is true by default, and is useful to disable prepared statements. The option is valid for PostgreSQL.

sql_query_timeout: timeout()

A time to wait for an SQL query response. The default value is 60 seconds.

sql_queue_type: ram | file

The type of a request queue for the SQL server. See description of queue_type option for the explanation. The default value is the value defined in queue_type or ram if the latter is not set.

sql_server: Host

A hostname or an IP address of the SQL server. The default value is localhost.

Note about the next option: improved in 20.03:

sql_ssl: true | false

Whether to use SSL encrypted connections to the SQL server. The option is only available for MySQL and PostgreSQL. The default value is false.

sql_ssl_cafile: Path

A path to a file with CA root certificates that will be used to verify SQL connections. Implies sql_ssl and sql_ssl_verify options are set to true. There is no default which means certificate verification is disabled.

sql_ssl_certfile: Path

A path to a certificate file that will be used for SSL connections to the SQL server. Implies sql_ssl option is set to true. There is no default which means ejabberd won’t provide a client certificate to the SQL server.

sql_ssl_verify: true | false

Whether to verify SSL connection to the SQL server against CA root certificates defined in sql_ssl_cafile option. Implies sql_ssl option is set to true. The default value is false.

sql_start_interval: timeout()

A time to wait before retrying to restore failed SQL connection. The default value is 30 seconds.

sql_type: mssql | mysql | odbc | pgsql | sqlite

The type of an SQL connection. The default is odbc.

sql_username: Username

A user name for SQL authentication. The default value is ejabberd.

trusted_proxies: all | [Network1, Network2, ...]

Specify what proxies are trusted when an HTTP request contains the header X-Forwarded-For. You can specify all to allow all proxies, or specify a list of IPs, possibly with masks. The default value is an empty list. This allows, if enabled, to be able to know the real IP of the request, for admin purpose, or security configuration (for example using mod_fail2ban). IMPORTANT: The proxy MUST be configured to set the X-Forwarded-For header if you enable this option as, otherwise, the client can set it itself and as a result the IP value cannot be trusted for security rules in ejabberd.

use_cache: true | false

Enable or disable cache. The default is true. Several modules have a similar option; and some core ejabberd parts support similar options too, see auth_use_cache, oauth_use_cache, router_use_cache, and sm_use_cache.

validate_stream: true | false

Whether to validate any incoming XML packet according to the schemas of supported XMPP extensions. WARNING: the validation is only intended for the use by client developers - don’t enable it in production environment. The default value is false.

version: string()

The option can be used to set custom ejabberd version, that will be used by different parts of ejabberd, for example by mod_version module. The default value is obtained at compile time from the underlying version control system.

websocket_origin: ignore | URL

This option enables validation for Origin header to protect against connections from other domains than given in the configuration file. In this way, the lower layer load balancer can be chosen for a specific ejabberd implementation while still providing a secure Websocket connection. The default value is ignore. An example value of the URL is "https://test.example.org:8081".

websocket_ping_interval: timeout()

Defines time between pings sent by the server to a client (Websocket level protocol pings are used for this) to keep a connection active. If the client doesn’t respond to two consecutive pings, the connection will be assumed as closed. The value of 0 can be used to disable the feature. This option makes the server sending pings only for connections using the RFC compliant protocol. For older style connections the server expects that whitespace pings would be used for this purpose. The default value is 60 seconds.

websocket_timeout: timeout()

Amount of time without any communication after which the connection would be closed. The default value is 300 seconds.

## MODULES
This section describes options of all ejabberd modules.

### mod_adhoc
This module implements XEP-0050: Ad-Hoc Commands. It’s an auxiliary module and is only needed by some of the other modules.

Available options:

report_commands_node: true | false

Provide the Commands item in the Service Discovery. Default value: false.

### mod_admin_extra
This module provides additional administrative commands.

Details for some commands:

•ban-acount: This command kicks all the connected sessions of the account from the server. It also changes their password to a randomly generated one, so they can’t login anymore unless a server administrator changes their password again. It is possible to define the reason of the ban. The new password also includes the reason and the date and time of the ban. See an example below.

•pushroster: (and pushroster-all) The roster file must be placed, if using Windows, on the directory where you installed ejabberd: C:/Program Files/ejabberd or similar. If you use other Operating System, place the file on the same directory where the .beam files are installed. See below an example roster file.

•srg-create: If you want to put a group Name with blankspaces, use the characters "' and '" to define when the Name starts and ends. See an example below.

The module has no options.

Examples:

With this configuration, vCards can only be modified with mod_admin_extra commands:

```
acl:

  adminextraresource:

    - resource: "modadminextraf8x,31ad"
access_rules:

  vcard_set:

    - allow: adminextraresource
modules:

  mod_admin_extra: {}

  mod_vcard:

    access_set: vcard_set
```

Content of roster file for pushroster command:

```
[{<<"bob">>, <<"example.org">>, <<"workers">>, <<"Bob">>},
{<<"mart">>, <<"example.org">>, <<"workers">>, <<"Mart">>},
{<<"Rich">>, <<"example.org">>, <<"bosses">>, <<"Rich">>}].
```

With this call, the sessions of the local account which JID is boby@example.org will be kicked, and its password will be set to something like BANNED_ACCOUNT—20080425T21:45:07—2176635—Spammed_rooms

```
ejabberdctl vhost example.org ban-account boby "Spammed rooms"
```

Call to srg-create using double-quotes and single-quotes:

```
ejabberdctl srg-create g1 example.org "'Group number 1'" this_is_g1 g1
```

### mod_admin_update_sql
This module can be used to update existing SQL database from the default to the new schema. Check the section Default and New Schemas for details. Please note that only PostgreSQL is supported. When the module is loaded use update_sql API.

The module has no options.

### mod_announce
This module enables configured users to broadcast announcements and to set the message of the day (MOTD). Configured users can perform these actions with an XMPP client either using Ad-hoc Commands or sending messages to specific JIDs.

Note that this module can be resource intensive on large deployments as it may broadcast a lot of messages. This module should be disabled for instances of ejabberd with hundreds of thousands users.

The Ad-hoc Commands are listed in the Server Discovery. For this feature to work, mod_adhoc must be enabled.

The specific JIDs where messages can be sent are listed below. The first JID in each entry will apply only to the specified virtual host example.org, while the JID between brackets will apply to all virtual hosts in ejabberd:

•example.org/announce/all (example.org/announce/all-hosts/all):: The message is sent to all registered users. If the user is online and connected to several resources, only the resource with the highest priority will receive the message. If the registered user is not connected, the message will be stored offline in assumption that offline storage (see mod_offline) is enabled.

•example.org/announce/online (example.org/announce/all-hosts/online):: The message is sent to all connected users. If the user is online and connected to several resources, all resources will receive the message.

•example.org/announce/motd (example.org/announce/all-hosts/motd):: The message is set as the message of the day (MOTD) and is sent to users when they login. In addition the message is sent to all connected users (similar to announce/online).

•example.org/announce/motd/update (example.org/announce/all-hosts/motd/update):: The message is set as message of the day (MOTD) and is sent to users when they login. The message is not sent to any currently connected user.

•example.org/announce/motd/delete (example.org/announce/all-hosts/motd/delete):: Any message sent to this JID removes the existing message of the day (MOTD).

Available options:

access: AccessName

This option specifies who is allowed to send announcements and to set the message of the day. The default value is none (i.e. nobody is able to send such messages).

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_avatar
The purpose of the module is to cope with legacy and modern XMPP clients posting avatars. The process is described in XEP-0398: User Avatar to vCard-Based Avatars Conversion.

Also, the module supports conversion between avatar image formats on the fly.

The module depends on mod_vcard, mod_vcard_xupdate and mod_pubsub.

Available options:

convert: {From: To}

Defines image convertion rules: the format in From will be converted to format in To. The value of From can also be default, which is match-all rule. NOTE: the list of supported formats is detected at compile time depending on the image libraries installed in the system. Example:

```
convert:

  webp: jpg

  default: png
```

rate_limit: Number

Limit any given JID by the number of avatars it is able to convert per minute. This is to protect the server from image convertion DoS. The default value is 10.

### mod_block_strangers
This module allows to block/log messages coming from an unknown entity. If a writing entity is not in your roster, you can let this module drop and/or log the message. By default you’ll just not receive message from that entity. Enable this module if you want to drop SPAM messages.

Available options:

access: AccessName

The option is supposed to be used when allow_local_users and allow_transports are not enough. It’s an ACL where deny means the message will be rejected (or a CAPTCHA would be generated for a presence, if configured), and allow means the sender is whitelisted and the stanza will pass through. The default value is none, which means nothing is whitelisted.

allow_local_users: true | false

This option specifies if strangers from the same local host should be accepted or not. The default value is true.

allow_transports: true | false

If set to true and some server’s JID is in user’s roster, then messages from any user of this server are accepted even if no subscription present. The default value is true.

captcha: true | false

Whether to generate CAPTCHA or not in response to messages from strangers. See also section CAPTCHA of the Configuration Guide. The default value is false.

drop: true | false

This option specifies if strangers messages should be dropped or not. The default value is true.

log: true | false

This option specifies if strangers' messages should be logged (as info message) in ejabberd.log. The default value is false.

### mod_blocking
The module implements XEP-0191: Blocking Command.

This module depends on mod_privacy where all the configuration is performed.

The module has no options.

### mod_bosh
This module implements XMPP over BOSH as defined in XEP-0124 and XEP-0206. BOSH stands for Bidirectional-streams Over Synchronous HTTP. It makes it possible to simulate long lived connections required by XMPP over the HTTP protocol. In practice, this module makes it possible to use XMPP in a browser without Websocket support and more generally to have a way to use XMPP while having to get through an HTTP proxy.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

json: true | false

This option has no effect.

max_concat: pos_integer() | infinity

This option limits the number of stanzas that the server will send in a single bosh request. The default value is unlimited.

max_inactivity: timeout()

The option defines the maximum inactivity period. The default value is 30 seconds.

max_pause: pos_integer()

Indicate the maximum length of a temporary session pause (in seconds) that a client can request. The default value is 120.

prebind: true | false

If enabled, the client can create the session without going through authentication. Basically, it creates a new session with anonymous authentication. The default value is false.

queue_type: ram | file

Same as top-level queue_type option, but applied to this module only.

ram_db_type: mnesia | sql | redis

Same as default_ram_db but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

Example:

```
listen:

  -

    port: 5222

    module: ejabberd_c2s

  -

    port: 5443

    module: ejabberd_http

    request_handlers:

      /bosh: mod_bosh
modules:

  mod_bosh: {}
```

### mod_caps
This module implements XEP-0115: Entity Capabilities. The main purpose of the module is to provide PEP functionality (see mod_pubsub).

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_carboncopy
The module implements XEP-0280: Message Carbons. The module broadcasts messages on all connected user resources (devices).

The module has no options.

### mod_client_state
This module allows for queueing certain types of stanzas when a client indicates that the user is not actively using the client right now (see XEP-0352: Client State Indication). This can save bandwidth and resources.

A stanza is dropped from the queue if it’s effectively obsoleted by a new one (e.g., a new presence stanza would replace an old one from the same client). The queue is flushed if a stanza arrives that won’t be queued, or if the queue size reaches a certain limit (currently 100 stanzas), or if the client becomes active again.

Available options:

queue_chat_states: true | false

Queue "standalone" chat state notifications (as defined in XEP-0085: Chat State Notifications) while a client indicates inactivity. The default value is true.

queue_pep: true | false

Queue PEP notifications while a client is inactive. When the queue is flushed, only the most recent notification of a given PEP node is delivered. The default value is true.

queue_presence: true | false

While a client is inactive, queue presence stanzas that indicate (un)availability. The default value is true.

### mod_configure
The module provides server configuration functionality via XEP-0050: Ad-Hoc Commands. This module requires mod_adhoc to be loaded.

The module has no options.

### mod_conversejs
This module serves a simple page for the Converse XMPP web browser client.

To use this module, in addition to adding it to the modules section, you must also enable it in listen → ejabberd_http → request_handlers.

You must also setup either the option websocket_url or bosh_service_url.

By default, the options conversejs_css and conversejs_script point to the public Converse.js client. Alternatively, you can host the client locally using mod_http_fileserver.

Available options:

bosh_service_url: BoshURL

BOSH service URL to which Converse.js can connect to.

conversejs_css: URL

Converse.js CSS URL.

conversejs_script: URL

Converse.js main script URL.

default_domain: Domain

Specify a domain to act as the default for user JIDs. The default value is the first domain defined in the ejabberd configuration file.

websocket_url: WebsocketURL

A websocket URL to which Converse.js can connect to.

Example:

```
listen:

  -

    port: 5280

    module: ejabberd_http

    request_handlers:

      /websocket: ejabberd_http_ws

      /conversejs: mod_conversejs
modules:

  mod_conversejs:

    websocket_url: "ws://example.org:5280/websocket"
```

### mod_delegation
This module is an implementation of XEP-0355: Namespace Delegation. Only admin mode has been implemented by now. Namespace delegation allows external services to handle IQ using specific namespace. This may be applied for external PEP service.

Warning Security issue: Namespace delegation gives components access to sensitive data, so permission should be granted carefully, only if you trust the component.

Note This module is complementary to mod_privilege but can also be used separately.

Available options:

namespaces: {Namespace: Options}

If you want to delegate namespaces to a component, specify them in this option, and associate them to an access rule. The Options are: access: AccessName

The option defines which components are allowed for namespace delegation. The default value is none.

filtering: Attributes

The list of attributes. Currently not used.

Examples:

Make sure you do not delegate the same namespace to several services at the same time. As in the example provided later, to have the sat-pubsub.example.org component perform correctly disable the mod_pubsub module.

```
access_rules:

  external_pubsub:

    allow: external_component

  external_mam:

    allow: external_component
acl:

  external_component:

    server: sat-pubsub.example.org
modules:

  ...

  mod_delegation:

    namespaces:

      urn:xmpp:mam:1:

        access: external_mam

      http://jabber.org/protocol/pubsub:

        access: external_pubsub
```

### mod_disco
This module adds support for XEP-0030: Service Discovery. With this module enabled, services on your server can be discovered by XMPP clients.

Available options:

extra_domains: [Domain, ...]

With this option, you can specify a list of extra domains that are added to the Service Discovery item list. The default value is an empty list.

name: Name

A name of the server in the Service Discovery. This will only be displayed by special XMPP clients. The default value is ejabberd.

server_info: [Info, ...]

Specify additional information about the server, as described in XEP-0157: Contact Addresses for XMPP Services. Every Info element in the list is constructed from the following options: modules: all | [Module, ...]

The value can be the keyword all, in which case the information is reported in all the services, or a list of ejabberd modules, in which case the information is only specified for the services provided by those modules.

name: Name

The field var name that will be defined. See XEP-0157 for some standardized names.

urls: [URI, ...]

A list of contact URIs, such as HTTP URLs, XMPP URIs and so on.

Example:

```
server_info:

  -

    modules: all

    name: abuse-addresses

    urls: ["mailto:abuse@shakespeare.lit"]

  -

    modules: [mod_muc]

    name: "Web chatroom logs"

    urls: ["http://www.example.org/muc-logs"]

  -

    modules: [mod_disco]

    name: feedback-addresses

    urls:

      - http://shakespeare.lit/feedback.php

      - mailto:feedback@shakespeare.lit

      - xmpp:feedback@shakespeare.lit

  -

    modules:

      - mod_disco

      - mod_vcard

    name: admin-addresses

    urls:

      - mailto:xmpp@shakespeare.lit

      - xmpp:admins@shakespeare.lit
```

### mod_fail2ban
The module bans IPs that show the malicious signs. Currently only C2S authentication failures are detected.

Unlike the standalone program, mod_fail2ban clears the record of authentication failures after some time since the first failure or on a successful authentication. It also does not simply block network traffic, but provides the client with a descriptive error message.

Warning You should not use this module behind a proxy or load balancer. ejabberd will see the failures as coming from the load balancer and, when the threshold of auth failures is reached, will reject all connections coming from the load balancer. You can lock all your user base out of ejabberd when using this module behind a proxy.

Available options:

access: AccessName

Specify an access rule for whitelisting IP addresses or networks. If the rule returns allow for a given IP address, that address will never be banned. The AccessName should be of type ip. The default value is none.

c2s_auth_ban_lifetime: timeout()

The lifetime of the IP ban caused by too many C2S authentication failures. The default value is 1 hour.

c2s_max_auth_failures: Number

The number of C2S authentication failures to trigger the IP ban. The default value is 20.

### mod_http_api
This module provides a ReST API to call ejabberd commands using JSON data.

To use this module, in addition to adding it to the modules section, you must also enable it in listen → ejabberd_http → request_handlers.

To use a specific API version N, when defining the URL path in the request_handlers, add a vN. For example: /api/v2: mod_http_api

To run a command, send a POST request to the corresponding URL: http://localhost:5280/api/<command_name>

The module has no options.

Example:

```
listen:

  -

    port: 5280

    module: ejabberd_http

    request_handlers:

      /api: mod_http_api
modules:

  mod_http_api: {}
```

### mod_http_fileserver
This simple module serves files from the local disk over HTTP.

Available options:

accesslog: Path

File to log accesses using an Apache-like format. No log will be recorded if this option is not specified.

content_types: {Extension: Type}

Specify mappings of extension to content type. There are several content types already defined. With this option you can add new definitions or modify existing ones. The default values are: Example:

```
content_types:

  .css: text/css

  .gif: image/gif

  .html: text/html

  .jar: application/java-archive

  .jpeg: image/jpeg

  .jpg: image/jpeg

  .js: text/javascript

  .png: image/png

  .svg: image/svg+xml

  .txt: text/plain

  .xml: application/xml

  .xpi: application/x-xpinstall

  .xul: application/vnd.mozilla.xul+xml
```

custom_headers: {Name: Value}

Indicate custom HTTP headers to be included in all responses. There are no custom headers by default.

default_content_type: Type

Specify the content type to use for unknown extensions. The default value is application/octet-stream.

directory_indices: [Index, ...]

Indicate one or more directory index files, similarly to Apache’s DirectoryIndex variable. When an HTTP request hits a directory instead of a regular file, those directory indices are looked in order, and the first one found is returned. The default value is an empty list.

docroot: Path

Directory to serve the files from. This is a mandatory option.

must_authenticate_with: [{Username, Hostname}, ...]

List of accounts that are allowed to use this service. Default value: [].

Examples:

This example configuration will serve the files from the local directory /var/www in the address http://example.org:5280/pub/archive/. In this example a new content type ogg is defined, png is redefined, and jpg definition is deleted:

```
listen:

  ...

  -

    port: 5280

    module: ejabberd_http

    request_handlers:

      ...

      /pub/archive: mod_http_fileserver

      ...

  ...
modules:

  ...

  mod_http_fileserver:

    docroot: /var/www

    accesslog: /var/log/ejabberd/access.log

    directory_indices:

      - index.html

      - main.htm

    custom_headers:

      X-Powered-By: Erlang/OTP

      X-Fry: "It's a widely-believed fact!"

    content_types:

      .ogg: audio/ogg

      .png: image/png

    default_content_type: text/html

  ...
```

### mod_http_upload
This module allows for requesting permissions to upload a file via HTTP as described in XEP-0363: HTTP File Upload. If the request is accepted, the client receives a URL for uploading the file and another URL from which that file can later be downloaded.

In order to use this module, it must be enabled in listen → ejabberd_http → request_handlers.

Available options:

access: AccessName

This option defines the access rule to limit who is permitted to use the HTTP upload service. The default value is local. If no access rule of that name exists, no user will be allowed to use the service.

custom_headers: {Name: Value}

This option specifies additional header fields to be included in all HTTP responses. By default no custom headers are included.

dir_mode: Permission

This option defines the permission bits of the docroot directory and any directories created during file uploads. The bits are specified as an octal number (see the chmod(1) manual page) within double quotes. For example: "0755". The default is undefined, which means no explicit permissions will be set.

docroot: Path

Uploaded files are stored below the directory specified (as an absolute path) with this option. The keyword @HOME@ is replaced with the home directory of the user running ejabberd, and the keyword @HOST@ with the virtual host name. The default value is "@HOME@/upload".

external_secret: Text

This option makes it possible to offload all HTTP Upload processing to a separate HTTP server. Both ejabberd and the HTTP server should share this secret and behave exactly as described at Prosody’s mod_http_upload_external in the Implementation section. There is no default value.

file_mode: Permission

This option defines the permission bits of uploaded files. The bits are specified as an octal number (see the chmod(1) manual page) within double quotes. For example: "0644". The default is undefined, which means no explicit permissions will be set.

get_url: URL

This option specifies the initial part of the GET URLs used for downloading the files. The default value is undefined. When this option is undefined, this option is set to the same value as put_url. The keyword @HOST@ is replaced with the virtual host name. NOTE: if GET requests are handled by mod_http_upload, the get_url must match the put_url. Setting it to a different value only makes sense if an external web server or mod_http_fileserver is used to serve the uploaded files.

host

Deprecated. Use hosts instead.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "upload.". The keyword @HOST@ is replaced with the real virtual host name.

jid_in_url: node | sha1

When this option is set to node, the node identifier of the user’s JID (i.e., the user name) is included in the GET and PUT URLs generated by mod_http_upload. Otherwise, a SHA-1 hash of the user’s bare JID is included instead. The default value is sha1.

max_size: Size

This option limits the acceptable file size. Either a number of bytes (larger than zero) or infinity must be specified. The default value is 104857600.

name: Name

A name of the service in the Service Discovery. This will only be displayed by special XMPP clients. The default value is "HTTP File Upload".

put_url: URL

This option specifies the initial part of the PUT URLs used for file uploads. The keyword @HOST@ is replaced with the virtual host name. NOTE: different virtual hosts cannot use the same PUT URL. The default value is "https://@HOST@:5443/upload".

rm_on_unregister: true | false

This option specifies whether files uploaded by a user should be removed when that user is unregistered. The default value is true.

secret_length: Length

This option defines the length of the random string included in the GET and PUT URLs generated by mod_http_upload. The minimum length is 8 characters, but it is recommended to choose a larger value. The default value is 40.

service_url

Deprecated.

thumbnail: true | false

This option specifies whether ejabberd should create thumbnails of uploaded images. If a thumbnail is created, a <thumbnail/> element that contains the download <uri/> and some metadata is returned with the PUT response. The default value is false.

vcard: vCard

A custom vCard of the service that will be displayed by some XMPP clients in Service Discovery. The value of vCard is a YAML map constructed from an XML representation of vCard. Since the representation has no attributes, the mapping is straightforward. For example, the following XML representation of vCard:

```
<vCard xmlns='vcard-temp'>

  <FN>Conferences</FN>

  <ADR>

    <WORK/>

    <STREET>Elm Street</STREET>

  </ADR>
</vCard>
```

will be translated to:

```
vcard:

  fn: Conferences

  adr:

    -

      work: true

      street: Elm Street
```

Example:

```
listen:

  ...

  -

    port: 5443

    module: ejabberd_http

    tls: true

    request_handlers:

      ...

      /upload: mod_http_upload

      ...

  ...
modules:

  ...

  mod_http_upload:

    docroot: /ejabberd/upload

    put_url: "https://@HOST@:5443/upload"

  ...
```

### mod_http_upload_quota
This module adds quota support for mod_http_upload.

This module depends on mod_http_upload.

Available options:

access_hard_quota: AccessName

This option defines which access rule is used to specify the "hard quota" for the matching JIDs. That rule must yield a positive number for any JID that is supposed to have a quota limit. This is the number of megabytes a corresponding user may upload. When this threshold is exceeded, ejabberd deletes the oldest files uploaded by that user until their disk usage equals or falls below the specified soft quota (see access_soft_quota). The default value is hard_upload_quota.

access_soft_quota: AccessName

This option defines which access rule is used to specify the "soft quota" for the matching JIDs. That rule must yield a positive number of megabytes for any JID that is supposed to have a quota limit. See the description of the access_hard_quota option for details. The default value is soft_upload_quota.

max_days: Days

If a number larger than zero is specified, any files (and directories) older than this number of days are removed from the subdirectories of the docroot directory, once per day. The default value is infinity.

Examples:

Please note that it’s not necessary to specify the access_hard_quota and access_soft_quota options in order to use the quota feature. You can stick to the default names and just specify access rules such as those in this example:

```
shaper_rules:

  ...

  soft_upload_quota:

    1000: all # MiB

  hard_upload_quota:

    1100: all # MiB

  ...
modules:

  ...

  mod_http_upload: {}

  mod_http_upload_quota:

    max_days: 100

  ...
```

### mod_jidprep
This module allows XMPP clients to ask the server to normalize a JID as per the rules specified in RFC 6122: XMPP Address Format. This might be useful for clients in certain constrained environments, or for testing purposes.

Available options:

access: AccessName

This option defines which access rule will be used to control who is allowed to use this service. The default value is local.

### mod_last
This module adds support for XEP-0012: Last Activity. It can be used to discover when a disconnected user last accessed the server, to know when a connected user was last active on the server, or to query the uptime of the ejabberd server.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_legacy_auth
The module implements XEP-0078: Non-SASL Authentication.

Note This type of authentication was obsoleted in 2008 and you unlikely need this module unless you have something like outdated Jabber bots.

The module has no options.

### mod_mam
This module implements XEP-0313: Message Archive Management. Compatible XMPP clients can use it to store their chat history on the server.

Available options:

access_preferences: AccessName

This access rule defines who is allowed to modify the MAM preferences. The default value is all.

assume_mam_usage: true | false

This option determines how ejabberd’s stream management code (see mod_stream_mgmt) handles unacknowledged messages when the connection is lost. Usually, such messages are either bounced or resent. However, neither is done for messages that were stored in the user’s MAM archive if this option is set to true. In this case, ejabberd assumes those messages will be retrieved from the archive. The default value is false.

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

clear_archive_on_room_destroy: true | false

Whether to destroy message archive of a room (see mod_muc) when it gets destroyed. The default value is true.

compress_xml: true | false

When enabled, new messages added to archives are compressed using a custom compression algorithm. This feature works only with SQL backends. The default value is false.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

default: always | never | roster

The option defines default policy for chat history. When always is set every chat message is stored. With roster only chat history with contacts from user’s roster is stored. And never fully disables chat history. Note that a client can change its policy via protocol commands. The default value is never.

request_activates_archiving: true | false

If the value is true, no messages are stored for a user until their client issue a MAM request, regardless of the value of the default option. Once the server received a request, that user’s messages are archived as usual. The default value is false.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

user_mucsub_from_muc_archive: true | false

When this option is disabled, for each individual subscriber a separa mucsub message is stored. With this option enabled, when a user fetches archive virtual mucsub, messages are generated from muc archives. The default value is false.

### mod_metrics
This module sends events to external backend (by now only grapherl is supported). Supported events are:

•sm_register_connection

•sm_remove_connection

•user_send_packet

•user_receive_packet

•s2s_send_packet

•s2s_receive_packet

•register_user

•remove_user

•offline_message

When enabled, every call to these hooks triggers a counter event to be sent to the external backend.

Available options:

ip: IPv4Address

IPv4 address where the backend is located. The default value is 127.0.0.1.

port: Port

An internet port number at which the backend is listening for incoming connections/packets. The default value is 11111.

### mod_mix
This module is an experimental implementation of XEP-0369: Mediated Information eXchange (MIX). MIX support was added in ejabberd 16.03 as an experimental feature, updated in 19.02, and is not yet ready to use in production. It’s asserted that the MIX protocol is going to replace the MUC protocol in the future (see mod_muc).

To learn more about how to use that feature, you can refer to our tutorial: Getting started with XEP-0369: Mediated Information eXchange (MIX) v0.1.

The module depends on mod_mam.

Available options:

access_create: AccessName

An access rule to control MIX channels creations. The default value is all.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

host

Deprecated. Use hosts instead.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "mix.". The keyword @HOST@ is replaced with the real virtual host name.

name: Name

A name of the service in the Service Discovery. This will only be displayed by special XMPP clients. The default value is Channels.

### mod_mix_pam
This module implements XEP-0405: Mediated Information eXchange (MIX): Participant Server Requirements. The module is needed if MIX compatible clients on your server are going to join MIX channels (either on your server or on any remote servers).

Note mod_mix is not required for this module to work, however, without mod_mix_pam the MIX functionality of your local XMPP clients will be impaired.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_mqtt
This module adds support for the MQTT protocol version 3.1.1 and 5.0. Remember to configure mod_mqtt in modules and listen sections.

Available options:

access_publish: {TopicFilter: AccessName}

Access rules to restrict access to topics for publishers. By default there are no restrictions.

access_subscribe: {TopicFilter: AccessName}

Access rules to restrict access to topics for subscribers. By default there are no restrictions.

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

match_retained_limit: pos_integer() | infinity

The option limits the number of retained messages returned to a client when it subscribes to some topic filter. The default value is 1000.

max_queue: Size

Maximum queue size for outgoing packets. The default value is 5000.

max_topic_aliases: 0..65535

The maximum number of aliases a client is able to associate with the topics. The default value is 100.

max_topic_depth: Depth

The maximum topic depth, i.e. the number of slashes (/) in the topic. The default value is 8.

queue_type: ram | file

Same as top-level queue_type option, but applied to this module only.

ram_db_type: mnesia

Same as top-level default_ram_db option, but applied to this module only.

session_expiry: timeout()

The option specifies how long to wait for an MQTT session resumption. When 0 is set, the session gets destroyed when the underlying client connection is closed. The default value is 5 minutes.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_muc
This module provides support for XEP-0045: Multi-User Chat. Users can discover existing rooms, join or create them. Occupants of a room can chat in public or have private chats.

The MUC service allows any Jabber ID to register a nickname, so nobody else can use that nickname in any room in the MUC service. To register a nickname, open the Service Discovery in your XMPP client and register in the MUC service.

This module supports clustering and load balancing. One module can be started per cluster node. Rooms are distributed at creation time on all available MUC module instances. The multi-user chat module is clustered but the rooms themselves are not clustered nor fault-tolerant: if the node managing a set of rooms goes down, the rooms disappear and they will be recreated on an available node on first connection attempt.

Available options:

access: AccessName

You can specify who is allowed to use the Multi-User Chat service. By default everyone is allowed to use it.

access_admin: AccessName

This option specifies who is allowed to administrate the Multi-User Chat service. The default value is none, which means that only the room creator can administer their room. The administrators can send a normal message to the service JID, and it will be shown in all active rooms as a service message. The administrators can send a groupchat message to the JID of an active room, and the message will be shown in the room as a service message.

access_create: AccessName

To configure who is allowed to create new rooms at the Multi-User Chat service, this option can be used. The default value is all, which means everyone is allowed to create rooms.

access_mam: AccessName

To configure who is allowed to modify the mam room option. The default value is all, which means everyone is allowed to modify that option.

access_persistent: AccessName

To configure who is allowed to modify the persistent room option. The default value is all, which means everyone is allowed to modify that option.

access_register: AccessName

This option specifies who is allowed to register nickname within the Multi-User Chat service. The default is all for backward compatibility, which means that any user is allowed to register any free nick.

db_type: mnesia | sql

Define the type of persistent storage where the module will store room information. The default is the storage defined by the global option default_db, or mnesia if omitted.

default_room_options: Options

This option allows to define the desired default room options. Note that the creator of a room can modify the options of his room at any time using an XMPP client with MUC capability. The Options are: allow_change_subj: true | false

Allow occupants to change the subject. The default value is true.

allow_private_messages: true | false

Occupants can send private messages to other occupants. The default value is true.

allow_private_messages_from_visitors: anyone | moderators | nobody

Visitors can send private messages to other occupants. The default value is anyone which means visitors can send private messages to any occupant.

allow_query_users: true | false

Occupants can send IQ queries to other occupants. The default value is true.

allow_subscription: true | false

Allow users to subscribe to room events as described in Multi-User Chat Subscriptions. The default value is false.

allow_user_invites: true | false

Allow occupants to send invitations. The default value is false.

allow_visitor_nickchange: true | false

Allow visitors to change nickname. The default value is true.

allow_visitor_status: true | false

Allow visitors to send status text in presence updates. If disallowed, the status text is stripped before broadcasting the presence update to all the room occupants. The default value is true.

anonymous: true | false

The room is anonymous: occupants don’t see the real JIDs of other occupants. Note that the room moderators can always see the real JIDs of the occupants. The default value is true.

captcha_protected: true | false

When a user tries to join a room where they have no affiliation (not owner, admin or member), the room requires them to fill a CAPTCHA challenge (see section CAPTCHA in order to accept their join in the room. The default value is false.

lang: Language

Preferred language for the discussions in the room. The language format should conform to RFC 5646. There is no value by default.

logging: true | false

The public messages are logged using mod_muc_log. The default value is false.

mam: true | false

Enable message archiving. Implies mod_mam is enabled. The default value is false.

max_users: Number

Maximum number of occupants in the room. The default value is 200.

members_by_default: true | false

The occupants that enter the room are participants by default, so they have "voice". The default value is true.

members_only: true | false

Only members of the room can enter. The default value is false.

moderated: true | false

Only occupants with "voice" can send public messages. The default value is true.

password: Password

Password of the room. Implies option password_protected set to true. There is no default value.

password_protected: true | false

The password is required to enter the room. The default value is false.

persistent: true | false

The room persists even if the last participant leaves. The default value is false.

presence_broadcast: [moderator | participant | visitor, ...]

List of roles for which presence is broadcasted. The list can contain one or several of: moderator, participant, visitor. The default value is shown in the example below: Example:

```
presence_broadcast:

  - moderator

  - participant

  - visitor
```

public: true | false

The room is public in the list of the MUC service, so it can be discovered. MUC admins and room participants will see private rooms in Service Discovery if their XMPP client supports this feature. The default value is true.

public_list: true | false

The list of participants is public, without requiring to enter the room. The default value is true.

title: Room Title

A human-readable title of the room. There is no default value

hibernation_timeout: infinity | Seconds

Timeout before hibernating the room process, expressed in seconds. The default value is infinity.

history_size: Size

A small history of the current discussion is sent to users when they enter the room. With this option you can define the number of history messages to keep and send to users joining the room. The value is a non-negative integer. Setting the value to 0 disables the history feature and, as a result, nothing is kept in memory. The default value is 20. This value affects all rooms on the service. NOTE: modern XMPP clients rely on Message Archives (XEP-0313), so feel free to disable the history feature if you’re only using modern clients and have mod_mam module loaded.

host

Deprecated. Use hosts instead.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "conference.". The keyword @HOST@ is replaced with the real virtual host name.

Note about the next option: added in 21.01:

max_captcha_whitelist: Number

This option defines the maximum number of characters that Captcha Whitelist can have when configuring the room. The default value is infinity.

Note about the next option: added in 21.01:

max_password: Number

This option defines the maximum number of characters that Password can have when configuring the room. The default value is infinity.

max_room_desc: Number

This option defines the maximum number of characters that Room Description can have when configuring the room. The default value is infinity.

max_room_id: Number

This option defines the maximum number of characters that Room ID can have when creating a new room. The default value is infinity.

max_room_name: Number

This option defines the maximum number of characters that Room Name can have when configuring the room. The default value is infinity.

max_rooms_discoitems: Number

When there are more rooms than this Number, only the non-empty ones are returned in a Service Discovery query. The default value is 100.

max_user_conferences: Number

This option defines the maximum number of rooms that any given user can join. The default value is 100. This option is used to prevent possible abuses. Note that this is a soft limit: some users can sometimes join more conferences in cluster configurations.

max_users: Number

This option defines at the service level, the maximum number of users allowed per room. It can be lowered in each room configuration but cannot be increased in individual room configuration. The default value is 200.

max_users_admin_threshold: Number

This option defines the number of service admins or room owners allowed to enter the room when the maximum number of allowed occupants was reached. The default limit is 5.

max_users_presence: Number

This option defines after how many users in the room, it is considered overcrowded. When a MUC room is considered overcrowed, presence broadcasts are limited to reduce load, traffic and excessive presence "storm" received by participants. The default value is 1000.

min_message_interval: Number

This option defines the minimum interval between two messages send by an occupant in seconds. This option is global and valid for all rooms. A decimal value can be used. When this option is not defined, message rate is not limited. This feature can be used to protect a MUC service from occupant abuses and limit number of messages that will be broadcasted by the service. A good value for this minimum message interval is 0.4 second. If an occupant tries to send messages faster, an error is send back explaining that the message has been discarded and describing the reason why the message is not acceptable.

min_presence_interval: Number

This option defines the minimum of time between presence changes coming from a given occupant in seconds. This option is global and valid for all rooms. A decimal value can be used. When this option is not defined, no restriction is applied. This option can be used to protect a MUC service for occupants abuses. If an occupant tries to change its presence more often than the specified interval, the presence is cached by ejabberd and only the last presence is broadcasted to all occupants in the room after expiration of the interval delay. Intermediate presence packets are silently discarded. A good value for this option is 4 seconds.

name: string()

The value of the service name. This name is only visible in some clients that support XEP-0030: Service Discovery. The default is Chatrooms.

preload_rooms: true | false

Whether to load all persistent rooms in memory on startup. If disabled, the room is only loaded on first participant join. The default is true. It makes sense to disable room preloading when the number of rooms is high: this will improve server startup time and memory consumption.

queue_type: ram | file

Same as top-level queue_type option, but applied to this module only.

ram_db_type: mnesia | sql

Define the type of volatile (in-memory) storage where the module will store room information (muc_online_room and muc_online_users).

regexp_room_id: string()

This option defines the regular expression that a Room ID must satisfy to allow the room creation. The default value is the empty string.

room_shaper: none | ShaperName

This option defines shaper for the MUC rooms. The default value is none.

user_message_shaper: none | ShaperName

This option defines shaper for the users messages. The default value is none.

user_presence_shaper: none | ShaperName

This option defines shaper for the users presences. The default value is none.

vcard: vCard

A custom vCard of the service that will be displayed by some XMPP clients in Service Discovery. The value of vCard is a YAML map constructed from an XML representation of vCard. Since the representation has no attributes, the mapping is straightforward. For example, the following XML representation of vCard:

```
<vCard xmlns='vcard-temp'>

  <FN>Conferences</FN>

  <ADR>

    <WORK/>

    <STREET>Elm Street</STREET>

  </ADR>
</vCard>
```

will be translated to:

```
vcard:

  fn: Conferences

  adr:

    -

      work: true

      street: Elm Street
```

### mod_muc_admin
This module provides commands to administer local MUC services and their MUC rooms. It also provides simple WebAdmin pages to view the existing rooms.

This module depends on mod_muc.

The module has no options.

### mod_muc_log
This module enables optional logging of Multi-User Chat (MUC) public conversations to HTML. Once you enable this module, users can join a room using a MUC capable XMPP client, and if they have enough privileges, they can request the configuration form in which they can set the option to enable room logging.

Features:

•Room details are added on top of each page: room title, JID, author, subject and configuration.

•The room JID in the generated HTML is a link to join the room (using XMPP URI).

•Subject and room configuration changes are tracked and displayed.

•Joins, leaves, nick changes, kicks, bans and /me are tracked and displayed, including the reason if available.

•Generated HTML files are XHTML 1.0 Transitional and CSS compliant.

•Timestamps are self-referencing links.

•Links on top for quicker navigation: Previous day, Next day, Up.

•CSS is used for style definition, and a custom CSS file can be used.

•URLs on messages and subjects are converted to hyperlinks.

•Timezone used on timestamps is shown on the log files.

•A custom link can be added on top of each page.

The module depends on mod_muc.

Available options:

access_log: AccessName

This option restricts which occupants are allowed to enable or disable room logging. The default value is muc_admin. NOTE: for this default setting you need to have an access rule for muc_admin in order to take effect.

cssfile: Path | URL

With this option you can set whether the HTML files should have a custom CSS file or if they need to use the embedded CSS. Allowed values are either Path to local file or an URL to a remote file. By default a predefined CSS will be embedded into the HTML page.

dirname: room_jid | room_name

Allows to configure the name of the room directory. If set to room_jid, the room directory name will be the full room JID. Otherwise, the room directory name will be only the room name, not including the MUC service name. The default value is room_jid.

dirtype: subdirs | plain

The type of the created directories can be specified with this option. If set to subdirs, subdirectories are created for each year and month. Otherwise, the names of the log files contain the full date, and there are no subdirectories. The default value is subdirs.

file_format: html | plaintext

Define the format of the log files: html stores in HTML format, plaintext stores in plain text. The default value is html.

file_permissions: {mode: Mode, group: Group}

Define the permissions that must be used when creating the log files: the number of the mode, and the numeric id of the group that will own the files. The default value is shown in the example below: Example:

```
file_permissions:

  mode: 644

  group: 33
```

outdir: Path

This option sets the full path to the directory in which the HTML files should be stored. Make sure the ejabberd daemon user has write access on that directory. The default value is www/muc.

spam_prevention: true | false

If set to true, a special attribute is added to links that prevent their indexation by search engines. The default value is true, which mean that nofollow attributes will be added to user submitted links.

timezone: local | universal

The time zone for the logs is configurable with this option. If set to local, the local time, as reported to Erlang emulator by the operating system, will be used. Otherwise, UTC time will be used. The default value is local.

top_link: {URL: Text}

With this option you can customize the link on the top right corner of each log file. The default value is shown in the example below: Example:

```
top_link:

  /: Home
```

url: URL

A top level URL where a client can access logs of a particular conference. The conference name is appended to the URL if dirname option is set to room_name or a conference JID is appended to the URL otherwise. There is no default value.

### mod_multicast
This module implements a service for XEP-0033: Extended Stanza Addressing.

Available options:

access: Access

The access rule to restrict who can send packets to the multicast service. Default value: all.

host

Deprecated. Use hosts instead.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "multicast.". The keyword @HOST@ is replaced with the real virtual host name. The default value is multicast.@HOST@.

limits: Sender: Stanza: Number

Specify a list of custom limits which override the default ones defined in XEP-0033. Limits are defined per sender type and stanza type, where:

•sender can be: local or remote.

•stanza can be: message or presence.

•number can be a positive integer or infinite. Example:

```
# Default values:
local:

  message: 100

  presence: 100
remote:

  message: 20

  presence: 20
```

name

Service name to provide in the Info query to the Service Discovery. Default is "Multicast".

vcard

vCard element to return when queried. Default value is undefined.

Example:

```
# Only admins can send packets to multicast service
access_rules:

  multicast:

    - allow: admin
# If you want to allow all your users:
access_rules:

  multicast:

    - allow
# This allows both admins and remote users to send packets,
# but does not allow local users
acl:

  allservers:

    server_glob: "*"
access_rules:

  multicast:

    - allow: admin

    - deny: local

    - allow: allservers
modules:

  mod_multicast:

     host: multicast.example.org

     access: multicast

     limits:

       local:

         message: 40

         presence: infinite

       remote:

         message: 150
```

### mod_offline
This module implements XEP-0160: Best Practices for Handling Offline Messages and XEP-0013: Flexible Offline Message Retrieval. This means that all messages sent to an offline user will be stored on the server until that user comes online again. Thus it is very similar to how email works. A user is considered offline if no session presence priority > 0 are currently open.

Note ejabberdctl has a command to delete expired messages (see chapter Managing an ejabberd server in online documentation.

Available options:

access_max_user_messages: AccessName

This option defines which access rule will be enforced to limit the maximum number of offline messages that a user can have (quota). When a user has too many offline messages, any new messages that they receive are discarded, and a <resource-constraint/> error is returned to the sender. The default value is max_user_offline_messages.

bounce_groupchat: true | false

This option is use the disable an optimisation that avoids bouncing error messages when groupchat messages could not be stored as offline. It will reduce chat room load, without any drawback in standard use cases. You may change default value only if you have a custom module which uses offline hook after mod_offline. This option can be useful for both standard MUC and MucSub, but the bounce is much more likely to happen in the context of MucSub, so it is even more important to have it on large MucSub services. The default value is false, meaning the optimisation is enabled.

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

store_empty_body: true | false | unless_chat_state

Whether or not to store messages that lack a <body/> element. The default value is unless_chat_state, which tells ejabberd to store messages even if they lack the <body/> element, unless they only contain a chat state notification (as defined in XEP-0085: Chat State Notifications.

store_groupchat: true | false

Whether or not to store groupchat messages. The default value is false.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

use_mam_for_storage: true | false

This is an experimental option. Enabling this option will make mod_offline not use the former spool table for storing MucSub offline messages, but will use the archive table instead. This use of the archive table is cleaner and it makes it possible for clients to slowly drop the former offline use case and rely on message archive instead. It also further reduces the storage required when you enabled MucSub. Enabling this option has a known drawback for the moment: most of flexible message retrieval queries don’t work (those that allow retrieval/deletion of messages by id), but this specification is not widely used. The default value is false to keep former behaviour as default and ensure this option is disabled.

Examples:

This example allows power users to have as much as 5000 offline messages, administrators up to 2000, and all the other users up to 100:

```
acl:

  admin:

    user:

      - admin1@localhost

      - admin2@example.org

  poweruser:

    user:

      - bob@example.org

      - jane@example.org
shaper_rules:

  max_user_offline_messages:

    - 5000: poweruser

    - 2000: admin

    - 100
modules:

  ...

  mod_offline:

    access_max_user_messages: max_user_offline_messages

  ...
```

### mod_ping
This module implements support for XEP-0199: XMPP Ping and periodic keepalives. When this module is enabled ejabberd responds correctly to ping requests, as defined by the protocol.

Available options:

ping_ack_timeout: timeout()

How long to wait before deeming that a client has not answered a given server ping request. The default value is undefined.

ping_interval: timeout()

How often to send pings to connected clients, if option send_pings is set to true. If a client connection does not send or receive any stanza within this interval, a ping request is sent to the client. The default value is 1 minute.

send_pings: true | false

If this option is set to true, the server sends pings to connected clients that are not active in a given interval defined in ping_interval option. This is useful to keep client connections alive or checking availability. The default value is false.

timeout_action: none | kill

What to do when a client does not answer to a server ping request in less than period defined in ping_ack_timeout option: kill means destroying the underlying connection, none means to do nothing. NOTE: when mod_stream_mgmt is loaded and stream management is enabled by a client, killing the client connection doesn’t mean killing the client session - the session will be kept alive in order to give the client a chance to resume it. The default value is none.

Example:

```
modules:

  ...

  mod_ping:

    send_pings: true

    ping_interval: 4 min

    timeout_action: kill

  ...
```

### mod_pres_counter
This module detects flood/spam in presence subscriptions traffic. If a user sends or receives more of those stanzas in a given time interval, the exceeding stanzas are silently dropped, and a warning is logged.

Available options:

count: Number

The number of subscription presence stanzas (subscribe, unsubscribe, subscribed, unsubscribed) allowed for any direction (input or output) per time defined in interval option. Please note that two users subscribing to each other usually generate 4 stanzas, so the recommended value is 4 or more. The default value is 5.

interval: timeout()

The time interval. The default value is 1 minute.

Example:

```
modules:

  ...

  mod_pres_counter:

    count: 5

    interval: 30 secs

  ...
```

### mod_privacy
This module implements XEP-0016: Privacy Lists.

Note Nowadays modern XMPP clients rely on XEP-0191: Blocking Command which is implemented by mod_blocking module. However, you still need mod_privacy loaded in order for mod_blocking to work.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_private
This module adds support for XEP-0049: Private XML Storage.

Using this method, XMPP entities can store private data on the server, retrieve it whenever necessary and share it between multiple connected clients of the same user. The data stored might be anything, as long as it is a valid XML. One typical usage is storing a bookmark of all user’s conferences (XEP-0048: Bookmarks).

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_privilege
This module is an implementation of XEP-0356: Privileged Entity. This extension allows components to have privileged access to other entity data (send messages on behalf of the server or on behalf of a user, get/set user roster, access presence information, etc.). This may be used to write powerful external components, for example implementing an external PEP or MAM service.

By default a component does not have any privileged access. It is worth noting that the permissions grant access to the component to a specific data type for all users of the virtual host on which mod_privilege is loaded.

Make sure you have a listener configured to connect your component. Check the section about listening ports for more information.

Warning Security issue: Privileged access gives components access to sensitive data, so permission should be granted carefully, only if you trust a component.

Note This module is complementary to mod_delegation, but can also be used separately.

Available options:

message: Options

This option defines permissions for messages. By default no permissions are given. The Options are: outgoing: AccessName

The option defines an access rule for sending outgoing messages by the component. The default value is none.

presence: Options

This option defines permissions for presences. By default no permissions are given. The Options are: managed_entity: AccessName

An access rule that gives permissions to the component to receive server presences. The default value is none.

roster: AccessName

An access rule that gives permissions to the component to receive the presence of both the users and the contacts in their roster. The default value is none.

roster: Options

This option defines roster permissions. By default no permissions are given. The Options are: both: AccessName

Sets read/write access to a user’s roster. The default value is none.

get: AccessName

Sets read access to a user’s roster. The default value is none.

set: AccessName

Sets write access to a user’s roster. The default value is none.

Example:

```
modules:

  ...

  mod_privilege:

    roster:

      get: all

    presence:

      managed_entity: all

    message:

      outgoing: all

  ...
```

### mod_proxy65
This module implements XEP-0065: SOCKS5 Bytestreams. It allows ejabberd to act as a file transfer proxy between two XMPP clients.

Available options:

access: AccessName

Defines an access rule for file transfer initiators. The default value is all. You may want to restrict access to the users of your server only, in order to avoid abusing your proxy by the users of remote servers.

auth_type: anonymous | plain

SOCKS5 authentication type. The default value is anonymous. If set to plain, ejabberd will use authentication backend as it would for SASL PLAIN.

host

Deprecated. Use hosts instead.

hostname: Host

Defines a hostname offered by the proxy when establishing a session with clients. This is useful when you run the proxy behind a NAT. The keyword @HOST@ is replaced with the virtual host name. The default is to use the value of ip option. Examples: proxy.mydomain.org, 200.150.100.50.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "proxy.". The keyword @HOST@ is replaced with the real virtual host name.

ip: IPAddress

This option specifies which network interface to listen for. The default value is an IP address of the service’s DNS name, or, if fails, 127.0.0.1.

max_connections: pos_integer() | infinity

Maximum number of active connections per file transfer initiator. The default value is infinity.

name: Name

The value of the service name. This name is only visible in some clients that support XEP-0030: Service Discovery. The default is "SOCKS5 Bytestreams".

port: 1..65535

A port number to listen for incoming connections. The default value is 7777.

ram_db_type: mnesia | redis | sql

Define the type of volatile (in-memory) storage where the module will store room information.

recbuf: Size

A size of the buffer for incoming packets. If you define a shaper, set the value of this option to the size of the shaper in order to avoid traffic spikes in file transfers. The default value is 65536 bytes.

shaper: Shaper

This option defines a shaper for the file transfer peers. A shaper with the maximum bandwidth will be selected. The default is none, i.e. no shaper.

sndbuf: Size

A size of the buffer for outgoing packets. If you define a shaper, set the value of this option to the size of the shaper in order to avoid traffic spikes in file transfers. The default value is 65536 bytes.

vcard: vCard

A custom vCard of the service that will be displayed by some XMPP clients in Service Discovery. The value of vCard is a YAML map constructed from an XML representation of vCard. Since the representation has no attributes, the mapping is straightforward. For example, the following XML representation of vCard:

```
<vCard xmlns='vcard-temp'>

  <FN>Conferences</FN>

  <ADR>

    <WORK/>

    <STREET>Elm Street</STREET>

  </ADR>
</vCard>
```

will be translated to:

```
vcard:

  fn: Conferences

  adr:

    -

      work: true

      street: Elm Street
```

Example:

```
acl:

  admin:

    user: admin@example.org

  proxy_users:

    server: example.org
access_rules:

  proxy65_access:

    allow: proxy_users
shaper_rules:

  proxy65_shaper:

    none: admin

  proxyrate: proxy_users
shaper:

  proxyrate: 10240
modules:

  ...

  mod_proxy65:

    host: proxy1.example.org

    name: "File Transfer Proxy"

    ip: 200.150.100.1

    port: 7778

    max_connections: 5

    access: proxy65_access

    shaper: proxy65_shaper

    recbuf: 10240

    sndbuf: 10240

  ...
```

### mod_pubsub
This module offers a service for XEP-0060: Publish-Subscribe. The functionality in mod_pubsub can be extended using plugins. The plugin that implements PEP (XEP-0163: Personal Eventing via Pubsub) is enabled in the default ejabberd configuration file, and it requires mod_caps.

Available options:

access_createnode: AccessName

This option restricts which users are allowed to create pubsub nodes using acl and access. By default any account in the local ejabberd server is allowed to create pubsub nodes. The default value is: all.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

default_node_config: List of Key:Value

To override default node configuration, regardless of node plugin. Value is a list of key-value definition. Node configuration still uses default configuration defined by node plugin, and overrides any items by value defined in this configurable list.

force_node_config: List of Node and the list of its Key:Value

Define the configuration for given nodes. The default value is: []. Example:

```
force_node_config:

  ## Avoid buggy clients to make their bookmarks public

  storage:bookmarks:

    access_model: whitelist
```

host

Deprecated. Use hosts instead.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "pubsub.". The keyword @HOST@ is replaced with the real virtual host name.

ignore_pep_from_offline: false | true

To specify whether or not we should get last published PEP items from users in our roster which are offline when we connect. Value is true or false. If not defined, pubsub assumes true so we only get last items of online contacts.

last_item_cache: false | true

To specify whether or not pubsub should cache last items. Value is true or false. If not defined, pubsub does not cache last items. On systems with not so many nodes, caching last items speeds up pubsub and allows to raise user connection rate. The cost is memory usage, as every item is stored in memory.

max_item_expire_node: timeout() | infinity

Specify the maximum item epiry time. Default value is: infinity.

max_items_node: non_neg_integer() | infinity

Define the maximum number of items that can be stored in a node. Default value is: 1000.

max_nodes_discoitems: pos_integer() | infinity

The maximum number of nodes to return in a discoitem response. The default value is: 100.

max_subscriptions_node: MaxSubs

Define the maximum number of subscriptions managed by a node. Default value is no limitation: undefined.

name: Name

The value of the service name. This name is only visible in some clients that support XEP-0030: Service Discovery. The default is vCard User Search.

nodetree: Nodetree

To specify which nodetree to use. If not defined, the default pubsub nodetree is used: tree. Only one nodetree can be used per host, and is shared by all node plugins.

•tree nodetree store node configuration and relations on the database. flat nodes are stored without any relationship, and hometree nodes can have child nodes.

•virtual nodetree does not store nodes on database. This saves resources on systems with tons of nodes. If using the virtual nodetree, you can only enable those node plugins: [flat, pep] or [flat]; any other plugins configuration will not work. Also, all nodes will have the default configuration, and this can not be changed. Using virtual nodetree requires to start from a clean database, it will not work if you used the default tree nodetree before.

pep_mapping: List of Key:Value

This allows to define a list of key-value to choose defined node plugins on given PEP namespace. The following example will use node_tune instead of node_pep for every PEP node with the tune namespace: Example:

```
modules:

  ...

  mod_pubsub:

    pep_mapping:

      http://jabber.org/protocol/tune: tune

  ...
```

plugins: [Plugin, ...]

To specify which pubsub node plugins to use. The first one in the list is used by default. If this option is not defined, the default plugins list is: [flat]. PubSub clients can define which plugin to use when creating a node: add type='plugin-name' attribute to the create stanza element.

•flat plugin handles the default behaviour and follows standard XEP-0060 implementation.

•pep plugin adds extention to handle Personal Eventing Protocol (XEP-0163) to the PubSub engine. Adding pep allows to handle PEP automatically.

vcard: vCard

A custom vCard of the server that will be displayed by some XMPP clients in Service Discovery. The value of vCard is a YAML map constructed from an XML representation of vCard. Since the representation has no attributes, the mapping is straightforward. The following XML representation of vCard:

```
<vCard xmlns='vcard-temp'>

  <FN>PubSub Service</FN>

  <ADR>

    <WORK/>

    <STREET>Elm Street</STREET>

  </ADR>
</vCard>
```

will be translated to:

```
vcard:

  fn: PubSub Service

  adr:

    -

      work: true

      street: Elm Street
```

Examples:

Example of configuration that uses flat nodes as default, and allows use of flat, hometree and pep nodes:

```
modules:

  ...

  mod_pubsub:

    access_createnode: pubsub_createnode

    max_subscriptions_node: 100

    default_node_config:

      notification_type: normal

      notify_retract: false

      max_items: 4

    plugins:

      - flat

      - pep

  ...
```

Using relational database requires using mod_pubsub with db_type sql. Only flat, hometree and pep plugins supports SQL. The following example shows previous configuration with SQL usage:

```
modules:

  ...

  mod_pubsub:

    db_type: sql

    access_createnode: pubsub_createnode

    ignore_pep_from_offline: true

    last_item_cache: false

    plugins:

      - flat

      - pep

  ...
```

### mod_push
This module implements the XMPP server’s part of the push notification solution specified in XEP-0357: Push Notifications. It does not generate, for example, APNS or FCM notifications directly. Instead, it’s designed to work with so-called "app servers" operated by third-party vendors of mobile apps. Those app servers will usually trigger notification delivery to the user’s mobile device using platform-dependant backend services such as FCM or APNS.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

include_body: true | false | Text

If this option is set to true, the message text is included with push notifications generated for incoming messages with a body. The option can instead be set to a static Text, in which case the specified text will be included in place of the actual message body. This can be useful to signal the app server whether the notification was triggered by a message with body (as opposed to other types of traffic) without leaking actual message contents. The default value is "New message".

include_sender: true | false

If this option is set to true, the sender’s JID is included with push notifications generated for incoming messages with a body. The default value is false.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_push_keepalive
This module tries to keep the stream management session (see mod_stream_mgmt) of a disconnected mobile client alive if the client enabled push notifications for that session. However, the normal session resumption timeout is restored once a push notification is issued, so the session will be closed if the client doesn’t respond to push notifications.

The module depends on mod_push.

Available options:

resume_timeout: timeout()

This option specifies the period of time until the session of a disconnected push client times out. This timeout is only in effect as long as no push notification is issued. Once that happened, the resumption timeout configured for mod_stream_mgmt is restored. The default value is 72 hours.

wake_on_start: true | false

If this option is set to true, notifications are generated for all registered push clients during server startup. This option should not be enabled on servers with many push clients as it can generate significant load on the involved push services and the server itself. The default value is false.

wake_on_timeout: true | false

If this option is set to true, a notification is generated shortly before the session would time out as per the resume_timeout option. The default value is true.

### mod_register
This module adds support for XEP-0077: In-Band Registration. This protocol enables end users to use an XMPP client to:

•Register a new account on the server.

•Change the password from an existing account on the server.

•Delete an existing account on the server.

This module reads also the top-level registration_timeout option defined globally for the server, so please check that option documentation too.

Available options:

access: AccessName

Specify rules to restrict what usernames can be registered. If a rule returns deny on the requested username, registration of that user name is denied. There are no restrictions by default.

access_from: AccessName

By default, ejabberd doesn’t allow to register new accounts from s2s or existing c2s sessions. You can change it by defining access rule in this option. Use with care: allowing registration from s2s leads to uncontrolled massive accounts creation by rogue users.

access_remove: AccessName

Specify rules to restrict access for user unregistration. By default any user is able to unregister their account.

allow_modules: all | [Module, ...]

List of modules that can register accounts, or all. The default value is all, which is equivalent to something like [mod_register, mod_register_web].

captcha_protected: true | false

Protect registrations with CAPTCHA. The default is false.

ip_access: AccessName

Define rules to allow or deny account registration depending on the IP address of the XMPP client. The AccessName should be of type ip. The default value is all.

password_strength: Entropy

This option sets the minimum Shannon entropy for passwords. The value Entropy is a number of bits of entropy. The recommended minimum is 32 bits. The default is 0, i.e. no checks are performed.

redirect_url: URL

This option enables registration redirection as described in XEP-0077: In-Band Registration: Redirection.

registration_watchers: [JID, ...]

This option defines a list of JIDs which will be notified each time a new account is registered.

welcome_message: {subject: Subject, body: Body}

Set a welcome message that is sent to each newly registered account. The message will have subject Subject and text Body.

### mod_register_web
This module provides a web page where users can:

•Register a new account on the server.

•Change the password from an existing account on the server.

•Unregister an existing account on the server.

This module supports CAPTCHA to register a new account. To enable this feature, configure the top-level captcha_cmd and top-level captcha_url options.

As an example usage, the users of the host localhost can visit the page: https://localhost:5280/register/ It is important to include the last / character in the URL, otherwise the subpages URL will be incorrect.

This module is enabled in listen → ejabberd_http → request_handlers, no need to enable in modules. The module depends on mod_register where all the configuration is performed.

The module has no options.

Example:

```
listen:

  -

    port: 5280

    module: ejabberd_http

    request_handlers:

      /register: mod_register_web
modules:

  mod_register: {}
```

### mod_roster
This module implements roster management as defined in RFC6121 Section 2. The module also adds support for XEP-0237: Roster Versioning.

Available options:

access: AccessName

This option can be configured to specify rules to restrict roster management. If the rule returns deny on the requested user name, that user cannot modify their personal roster, i.e. they cannot add/remove/modify contacts or send presence subscriptions. The default value is all, i.e. no restrictions.

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Same as top-level default_db option, but applied to this module only.

store_current_id: true | false

If this option is set to true, the current roster version number is stored on the database. If set to false, the roster version number is calculated on the fly each time. Enabling this option reduces the load for both ejabberd and the database. This option does not affect the client in any way. This option is only useful if option versioning is set to true. The default value is false. IMPORTANT: if you use mod_shared_roster or mod_shared_roster_ldap, you must set the value of the option to false.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

versioning: true | false

Enables/disables Roster Versioning. The default value is false.

Example:

```
modules:

  ...

  mod_roster:

    versioning: true

    store_current_id: false

  ...
```

### mod_s2s_dialback
The module adds support for XEP-0220: Server Dialback to provide server identity verification based on DNS.

Warning DNS-based verification is vulnerable to DNS cache poisoning, so modern servers rely on verification based on PKIX certificates. Thus this module is only recommended for backward compatibility with servers running outdated software or non-TLS servers, or those with invalid certificates (as long as you accept the risks, e.g. you assume that the remote server has an invalid certificate due to poor administration and not because it’s compromised).

Available options:

access: AccessName

An access rule that can be used to restrict dialback for some servers. The default value is all.

Example:

```
modules:

  ...

  mod_s2s_dialback:

    access:

      allow:

        server: legacy.domain.tld

        server: invalid-cert.example.org

      deny: all

  ...
```

### mod_service_log
This module forwards copies of all stanzas to remote XMPP servers or components. Every stanza is encapsulated into <forwarded/> element as described in XEP-0297: Stanza Forwarding.

Available options:

loggers: [Domain, ...]

A list of servers or connected components to which stanzas will be forwarded.

Example:

```
modules:

  ...

  mod_service_log:

    loggers:

      - xmpp-server.tld

      - component.domain.tld

  ...
```

### mod_shared_roster
This module enables you to create shared roster groups: groups of accounts that can see members from (other) groups in their rosters.

The big advantages of this feature are that end users do not need to manually add all users to their rosters, and that they cannot permanently delete users from the shared roster groups. A shared roster group can have members from any XMPP server, but the presence will only be available from and to members of the same virtual host where the group is created. It still allows the users to have / add their own contacts, as it does not replace the standard roster. Instead, the shared roster contacts are merged to the relevant users at retrieval time. The standard user rosters thus stay unmodified.

Shared roster groups can be edited via the Web Admin, and some API commands called srg_*. Each group has a unique name and those parameters:

•Label: Used in the rosters where this group is displayed.

•Description: of the group, which has no effect.

•Members: A list of JIDs of group members, entered one per line in the Web Admin. The special member directive @all@ represents all the registered users in the virtual host; which is only recommended for a small server with just a few hundred users. The special member directive @online@ represents the online users in the virtual host. With those two directives, the actual list of members in those shared rosters is generated dynamically at retrieval time.

•Displayed: A list of groups that will be in the rosters of this group’s members. A group of other vhost can be identified with groupid@vhost.

This module depends on mod_roster. If not enabled, roster queries will return 503 errors.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql

Define the type of storage where the module will create the tables and store user information. The default is the storage defined by the top-level default_db option, or mnesia if omitted. If sql value is defined, make sure you have defined the database.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

Examples:

Take the case of a computer club that wants all its members seeing each other in their rosters. To achieve this, they need to create a shared roster group similar to this one:

```
Name: club_members
Label: Club Members
Description: Members from the computer club
Members: member1@example.org, member2@example.org, member3@example.org
Displayed Groups: club_members
```

In another case we have a company which has three divisions: Management, Marketing and Sales. All group members should see all other members in their rosters. Additionally, all managers should have all marketing and sales people in their roster. Simultaneously, all marketeers and the whole sales team should see all managers. This scenario can be achieved by creating shared roster groups as shown in the following lists:

```
First list:
Name: management
Label: Management
Description: Management
Members: manager1@example.org, manager2@example.org
Displayed: management, marketing, sales
Second list:
Name: marketing
Label: Marketing
Description: Marketing
Members: marketeer1@example.org, marketeer2@example.org, marketeer3@example.org
Displayed: management, marketing
Third list:
Name: sales
Label: Sales
Description: Sales
Members: salesman1@example.org, salesman2@example.org, salesman3@example.org
Displayed: management, sales
```

### mod_shared_roster_ldap
This module lets the server administrator automatically populate users' rosters (contact lists) with entries based on users and groups defined in an LDAP-based directory.

Note mod_shared_roster_ldap depends on mod_roster being enabled. Roster queries will return 503 errors if mod_roster is not enabled.

The module accepts many configuration options. Some of them, if unspecified, default to the values specified for the top level of configuration. This lets you avoid specifying, for example, the bind password in multiple places.

•Filters: ldap_rfilter, ldap_ufilter, ldap_gfilter, ldap_filter. These options specify LDAP filters used to query for shared roster information. All of them are run against the ldap_base.

•Attributes: ldap_groupattr, ldap_groupdesc, ldap_memberattr, ldap_userdesc, ldap_useruid. These options specify the names of the attributes which hold interesting data in the entries returned by running filters specified with the filter options.

•Control parameters: ldap_auth_check, ldap_group_cache_validity, ldap_memberattr_format, ldap_memberattr_format_re, ldap_user_cache_validity. These parameters control the behaviour of the module.

•Connection parameters: The module also accepts the connection parameters, all of which default to the top-level parameter of the same name, if unspecified. See LDAP Connection section for more information about them.

Check also the Configuration examples section to get details about retrieving the roster, and configuration examples including Flat DIT and Deep DIT.

Available options:

cache_life_time

Same as top-level cache_life_time option, but applied to this module only.

cache_missed

Same as top-level cache_missed option, but applied to this module only.

cache_size

Same as top-level cache_size option, but applied to this module only.

ldap_auth_check: true | false

Whether the module should check (via the ejabberd authentication subsystem) for existence of each user in the shared LDAP roster. Set to false if you want to disable the check. Default value is true.

ldap_backups

Same as top-level ldap_backups option, but applied to this module only.

ldap_base

Same as top-level ldap_base option, but applied to this module only.

ldap_deref_aliases

Same as top-level ldap_deref_aliases option, but applied to this module only.

ldap_encrypt

Same as top-level ldap_encrypt option, but applied to this module only.

ldap_filter

Additional filter which is AND-ed together with "User Filter" and "Group Filter". For more information check the LDAP Filters section.

ldap_gfilter

"Group Filter", used when retrieving human-readable name (a.k.a. "Display Name") and the members of a group. See also the parameters ldap_groupattr, ldap_groupdesc and ldap_memberattr. If unspecified, defaults to the top-level parameter of the same name. If that one also is unspecified, then the filter is constructed exactly like "User Filter".

ldap_groupattr

The name of the attribute that holds the group name, and that is used to differentiate between them. Retrieved from results of the "Roster Filter" and "Group Filter". Defaults to cn.

ldap_groupdesc

The name of the attribute which holds the human-readable group name in the objects you use to represent groups. Retrieved from results of the "Group Filter". Defaults to whatever ldap_groupattr is set.

ldap_memberattr

The name of the attribute which holds the IDs of the members of a group. Retrieved from results of the "Group Filter". Defaults to memberUid. The name of the attribute differs depending on the objectClass you use for your group objects, for example: posixGroup → memberUid; groupOfNames → member; groupOfUniqueNames → uniqueMember.

ldap_memberattr_format

A globbing format for extracting user ID from the value of the attribute named by ldap_memberattr. Defaults to %u, which means that the whole value is the member ID. If you change it to something different, you may also need to specify the User and Group Filters manually; see section Filters.

ldap_memberattr_format_re

A regex for extracting user ID from the value of the attribute named by ldap_memberattr. Check the LDAP Control Parameters section.

ldap_password

Same as top-level ldap_password option, but applied to this module only.

ldap_port

Same as top-level ldap_port option, but applied to this module only.

ldap_rfilter

So called "Roster Filter". Used to find names of all "shared roster" groups. See also the ldap_groupattr parameter. If unspecified, defaults to the top-level parameter of the same name. You must specify it in some place in the configuration, there is no default.

ldap_rootdn

Same as top-level ldap_rootdn option, but applied to this module only.

ldap_servers

Same as top-level ldap_servers option, but applied to this module only.

ldap_tls_cacertfile

Same as top-level ldap_tls_cacertfile option, but applied to this module only.

ldap_tls_certfile

Same as top-level ldap_tls_certfile option, but applied to this module only.

ldap_tls_depth

Same as top-level ldap_tls_depth option, but applied to this module only.

ldap_tls_verify

Same as top-level ldap_tls_verify option, but applied to this module only.

ldap_ufilter

"User Filter", used for retrieving the human-readable name of roster entries (usually full names of people in the roster). See also the parameters ldap_userdesc and ldap_useruid. For more information check the LDAP Filters section.

ldap_uids

Same as top-level ldap_uids option, but applied to this module only.

ldap_userdesc

The name of the attribute which holds the human-readable user name. Retrieved from results of the "User Filter". Defaults to cn.

ldap_userjidattr

The name of the attribute which is used to map user id to XMPP jid. If not specified (and that is default value of this option), user jid will be created from user id and this module host.

ldap_useruid

The name of the attribute which holds the ID of a roster item. Value of this attribute in the roster item objects needs to match the ID retrieved from the ldap_memberattr attribute of a group object. Retrieved from results of the "User Filter". Defaults to cn.

use_cache

Same as top-level use_cache option, but applied to this module only.

### mod_sic
This module adds support for XEP-0279: Server IP Check. This protocol enables a client to discover its external IP address.

Warning The protocol extension is deferred and seems like there are no clients supporting it, so using this module is not recommended and, furthermore, the module might be removed in the future.

The module has no options.

### mod_sip
This module adds SIP proxy/registrar support for the corresponding virtual host.

Note It is not enough to just load this module. You should also configure listeners and DNS records properly. For details see the section about the ejabberd_sip listen module in the ejabberd Documentation.

Available options:

always_record_route: true | false

Always insert "Record-Route" header into SIP messages. This approach allows to bypass NATs/firewalls a bit more easily. The default value is true.

flow_timeout_tcp: timeout()

The option sets a keep-alive timer for SIP outbound TCP connections. The default value is 2 minutes.

flow_timeout_udp: timeout()

The options sets a keep-alive timer for SIP outbound UDP connections. The default value is 29 seconds.

record_route: URI

When the option always_record_route is set to true or when SIP outbound is utilized, ejabberd inserts "Record-Route" header field with this URI into a SIP message. The default is a SIP URI constructed from the virtual host on which the module is loaded.

routes: [URI, ...]

You can set a list of SIP URIs of routes pointing to this SIP proxy server. The default is a list containing a single SIP URI constructed from the virtual host on which the module is loaded.

via: [URI, ...]

A list to construct "Via" headers for inserting them into outgoing SIP messages. This is useful if you’re running your SIP proxy in a non-standard network topology. Every URI element in the list must be in the form of "scheme://host:port", where "transport" must be tls, tcp, or udp, "host" must be a domain name or an IP address and "port" must be an internet port number. Note that all parts of the URI are mandatory (e.g. you cannot omit "port" or "scheme").

Example:

```
modules:

  ...

  mod_sip:

    always_record_route: false

    record_route: "sip:example.com;lr"

    routes:

      - "sip:example.com;lr"

      - "sip:sip.example.com;lr"

    flow_timeout_udp: 30 sec

    flow_timeout_tcp: 1 min

    via:

      - tls://sip-tls.example.com:5061

      - tcp://sip-tcp.example.com:5060

      - udp://sip-udp.example.com:5060

  ...
```

### mod_stats
This module adds support for XEP-0039: Statistics Gathering. This protocol allows you to retrieve the following statistics from your ejabberd server:

•Total number of registered users on the current virtual host (users/total).

•Total number of registered users on all virtual hosts (users/all-hosts/total).

•Total number of online users on the current virtual host (users/online).

•Total number of online users on all virtual hosts (users/all-hosts/online).

Note The protocol extension is deferred and seems like even a few clients that were supporting it are now abandoned. So using this module makes very little sense.

The module has no options.

### mod_stream_mgmt
This module adds support for XEP-0198: Stream Management. This protocol allows active management of an XML stream between two XMPP entities, including features for stanza acknowledgements and stream resumption.

Available options:

ack_timeout: timeout()

A time to wait for stanza acknowledgements. Setting it to infinity effectively disables the timeout. The default value is 1 minute.

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only. The default value is 48 hours.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

max_ack_queue: Size

This option specifies the maximum number of unacknowledged stanzas queued for possible retransmission. When the limit is exceeded, the client session is terminated. The allowed values are positive integers and infinity. You should be careful when setting this value as it should not be set too low, otherwise, you could kill sessions in a loop, before they get the chance to finish proper session initiation. It should definitely be set higher that the size of the offline queue (for example at least 3 times the value of the max offline queue and never lower than 1000). The default value is 5000.

max_resume_timeout: timeout()

A client may specify the period of time until a session times out if the connection is lost. During this period of time, the client may resume its session. This option limits the period of time a client is permitted to request. It must be set to a timeout equal to or larger than the default resume_timeout. By default, it is set to the same value as the resume_timeout option.

queue_type: ram | file

Same as top-level queue_type option, but applied to this module only.

resend_on_timeout: true | false | if_offline

If this option is set to true, any message stanzas that weren’t acknowledged by the client will be resent on session timeout. This behavior might often be desired, but could have unexpected results under certain circumstances. For example, a message that was sent to two resources might get resent to one of them if the other one timed out. Therefore, the default value for this option is false, which tells ejabberd to generate an error message instead. As an alternative, the option may be set to if_offline. In this case, unacknowledged messages are resent only if no other resource is online when the session times out. Otherwise, error messages are generated.

resume_timeout: timeout()

This option configures the (default) period of time until a session times out if the connection is lost. During this period of time, a client may resume its session. Note that the client may request a different timeout value, see the max_resume_timeout option. Setting it to 0 effectively disables session resumption. The default value is 5 minutes.

### mod_stun_disco
This module allows XMPP clients to discover STUN/TURN services and to obtain temporary credentials for using them as per XEP-0215: External Service Discovery. This module is included in ejabberd since version 20.04.

Available options:

access: AccessName

This option defines which access rule will be used to control who is allowed to discover STUN/TURN services and to request temporary credentials. The default value is local.

credentials_lifetime: timeout()

The lifetime of temporary credentials offered to clients. If ejabberd’s built-in TURN service is used, TURN relays allocated using temporary credentials will be terminated shortly after the credentials expired. The default value is 12 hours. Note that restarting the ejabberd node invalidates any temporary credentials offered before the restart unless a secret is specified (see below).

offer_local_services: true | false

This option specifies whether local STUN/TURN services configured as ejabberd listeners should be announced automatically. Note that this will not include TLS-enabled services, which must be configured manually using the services option (see below). For non-anonymous TURN services, temporary credentials will be offered to the client. The default value is true.

secret: Text

The secret used for generating temporary credentials. If this option isn’t specified, a secret will be auto-generated. However, a secret must be specified explicitly if non-anonymous TURN services running on other ejabberd nodes and/or external TURN services are configured. Also note that auto-generated secrets are lost when the node is restarted, which invalidates any credentials offered before the restart. Therefore, it’s recommended to explicitly specify a secret if clients cache retrieved credentials (for later use) across service restarts.

services: [Service, ...]

The list of services offered to clients. This list can include STUN/TURN services running on any ejabberd node and/or external services. However, if any listed TURN service not running on the local ejabberd node requires authentication, a secret must be specified explicitly, and must be shared with that service. This will only work with ejabberd’s built-in STUN/TURN server and with external servers that support the same REST API For Access To TURN Services. Unless the offer_local_services is set to false, the explicitly listed services will be offered in addition to those announced automatically. host: Host

The hostname or IP address the STUN/TURN service is listening on. For non-TLS services, it’s recommended to specify an IP address (to avoid additional DNS lookup latency on the client side). For TLS services, the hostname (or IP address) should match the certificate. Specifying the host option is mandatory.

port: 1..65535

The port number the STUN/TURN service is listening on. The default port number is 3478 for non-TLS services and 5349 for TLS services.

restricted: true | false

This option determines whether temporary credentials for accessing the service are offered. The default is false for STUN/STUNS services and true for TURN/TURNS services.

transport: tcp | udp

The transport protocol supported by the service. The default is udp for non-TLS services and tcp for TLS services.

type: stun | turn | stuns | turns

The type of service. Must be stun or turn for non-TLS services, stuns or turns for TLS services. The default type is stun.

Example:

```
services:

  -

    host: 203.0.113.3

    port: 3478

    type: stun

    transport: udp

    restricted: false

  -

    host: 203.0.113.3

    port: 3478

    type: turn

    transport: udp

    restricted: true

  -

    host: 2001:db8::3

    port: 3478

    type: stun

    transport: udp

    restricted: false

  -

    host: 2001:db8::3

    port: 3478

    type: turn

    transport: udp

    restricted: true

  -

    host: server.example.com

    port: 5349

    type: turns

    transport: tcp

    restricted: true
```

### mod_time
This module adds support for XEP-0202: Entity Time. In other words, the module reports server’s system time.

The module has no options.

### mod_vcard
This module allows end users to store and retrieve their vCard, and to retrieve other users vCards, as defined in XEP-0054: vcard-temp. The module also implements an uncomplicated Jabber User Directory based on the vCards of these users. Moreover, it enables the server to send its vCard when queried.

Available options:

allow_return_all: true | false

This option enables you to specify if search operations with empty input fields should return all users who added some information to their vCard. The default value is false.

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

db_type: mnesia | sql | ldap

Same as top-level default_db option, but applied to this module only.

host

Deprecated. Use hosts instead.

hosts: [Host, ...]

This option defines the Jabber IDs of the service. If the hosts option is not specified, the only Jabber ID will be the hostname of the virtual host with the prefix "vjud.". The keyword @HOST@ is replaced with the real virtual host name.

matches: pos_integer() | infinity

With this option, the number of reported search results can be limited. If the option’s value is set to infinity, all search results are reported. The default value is 30.

name: Name

The value of the service name. This name is only visible in some clients that support XEP-0030: Service Discovery. The default is vCard User Search.

search: true | false

This option specifies whether the search functionality is enabled or not. If disabled, the options hosts, name and vcard will be ignored and the Jabber User Directory service will not appear in the Service Discovery item list. The default value is false.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

vcard: vCard

A custom vCard of the server that will be displayed by some XMPP clients in Service Discovery. The value of vCard is a YAML map constructed from an XML representation of vCard. Since the representation has no attributes, the mapping is straightforward. For example, the following XML representation of vCard:

```
<vCard xmlns='vcard-temp'>

  <FN>Conferences</FN>

  <ADR>

    <WORK/>

    <STREET>Elm Street</STREET>

  </ADR>
</vCard>
```

will be translated to:

```
vcard:

  fn: Conferences

  adr:

    -

      work: true

      street: Elm Street
```

Available options for ldap backend:

ldap_backups

Same as top-level ldap_backups option, but applied to this module only.

ldap_base

Same as top-level ldap_base option, but applied to this module only.

ldap_deref_aliases

Same as top-level ldap_deref_aliases option, but applied to this module only.

ldap_encrypt

Same as top-level ldap_encrypt option, but applied to this module only.

ldap_filter

Same as top-level ldap_filter option, but applied to this module only.

ldap_password

Same as top-level ldap_password option, but applied to this module only.

ldap_port

Same as top-level ldap_port option, but applied to this module only.

ldap_rootdn

Same as top-level ldap_rootdn option, but applied to this module only.

ldap_search_fields: {Name: Attribute, ...}

This option defines the search form and the LDAP attributes to search within. Name is the name of a search form field which will be automatically translated by using the translation files (see msgs/*.msg for available words). Attribute is the LDAP attribute or the pattern %u. The default is:

```
User: "%u"
"Full Name": displayName
"Given Name": givenName
"Middle Name": initials
"Family Name": sn
Nickname: "%u"
Birthday: birthDay
Country: c
City: l
Email: mail
"Organization Name": o
"Organization Unit": ou
```

ldap_search_reported: {SearchField: VcardField}, ...}

This option defines which search fields should be reported. SearchField is the name of a search form field which will be automatically translated by using the translation files (see msgs/*.msg for available words). VcardField is the vCard field name defined in the ldap_vcard_map option. The default is:

```
"Full Name": FN
"Given Name": FIRST
"Middle Name": MIDDLE
"Family Name": LAST
"Nickname": NICKNAME
"Birthday": BDAY
"Country": CTRY
"City": LOCALITY
"Email": EMAIL
"Organization Name": ORGNAME
"Organization Unit": ORGUNIT
```

ldap_servers

Same as top-level ldap_servers option, but applied to this module only.

ldap_tls_cacertfile

Same as top-level ldap_tls_cacertfile option, but applied to this module only.

ldap_tls_certfile

Same as top-level ldap_tls_certfile option, but applied to this module only.

ldap_tls_depth

Same as top-level ldap_tls_depth option, but applied to this module only.

ldap_tls_verify

Same as top-level ldap_tls_verify option, but applied to this module only.

ldap_uids

Same as top-level ldap_uids option, but applied to this module only.

ldap_vcard_map: {Name: {Pattern, LDAPattributes}, ...}

With this option you can set the table that maps LDAP attributes to vCard fields. Name is the type name of the vCard as defined in RFC 2426. Pattern is a string which contains pattern variables %u, %d or %s. LDAPattributes is the list containing LDAP attributes. The pattern variables %s will be sequentially replaced with the values of LDAP attributes from List_of_LDAP_attributes, %u will be replaced with the user part of a JID, and %d will be replaced with the domain part of a JID. The default is:

```
NICKNAME: {"%u": []}
FN: {"%s": [displayName]}
LAST: {"%s": [sn]}
FIRST: {"%s": [givenName]}
MIDDLE: {"%s": [initials]}
ORGNAME: {"%s": [o]}
ORGUNIT: {"%s": [ou]}
CTRY: {"%s": [c]}
LOCALITY: {"%s": [l]}
STREET: {"%s": [street]}
REGION: {"%s": [st]}
PCODE: {"%s": [postalCode]}
TITLE: {"%s": [title]}
URL: {"%s": [labeleduri]}
DESC: {"%s": [description]}
TEL: {"%s": [telephoneNumber]}
EMAIL: {"%s": [mail]}
BDAY: {"%s": [birthDay]}
ROLE: {"%s": [employeeType]}
PHOTO: {"%s": [jpegPhoto]}
```

Available options for mnesia backend:

search_all_hosts: true | false

Whether to perform search on all virtual hosts or not. The default value is true.

### mod_vcard_xupdate
The user’s client can store an avatar in the user vCard. The vCard-Based Avatars protocol (XEP-0153) provides a method for clients to inform the contacts what is the avatar hash value. However, simple or small clients may not implement that protocol.

If this module is enabled, all the outgoing client presence stanzas get automatically the avatar hash on behalf of the client. So, the contacts receive the presence stanzas with the Update Data described in XEP-0153 as if the client would had inserted it itself. If the client had already included such element in the presence stanza, it is replaced with the element generated by ejabberd.

By enabling this module, each vCard modification produces a hash recalculation, and each presence sent by a client produces hash retrieval and a presence stanza rewrite. For this reason, enabling this module will introduce a computational overhead in servers with clients that change frequently their presence. However, the overhead is significantly reduced by the use of caching, so you probably don’t want to set use_cache to false.

The module depends on mod_vcard.

Note Nowadays XEP-0153 is used mostly as "read-only", i.e. modern clients don’t publish their avatars inside vCards. Thus in the majority of cases the module is only used along with mod_avatar for providing backward compatibility.

Available options:

cache_life_time: timeout()

Same as top-level cache_life_time option, but applied to this module only.

cache_missed: true | false

Same as top-level cache_missed option, but applied to this module only.

cache_size: pos_integer() | infinity

Same as top-level cache_size option, but applied to this module only.

use_cache: true | false

Same as top-level use_cache option, but applied to this module only.

### mod_version
This module implements XEP-0092: Software Version. Consequently, it answers ejabberd’s version when queried.

Available options:

show_os: true | false

Should the operating system be revealed or not. The default value is true.

## LISTENERS
This section describes options of all ejabberd listeners.

TODO

## AUTHOR
ProcessOne.

## VERSION
This document describes the configuration file of ejabberd 21.12. Configuration options of other ejabberd versions may differ significantly.

## REPORTING BUGS
Report bugs to https://github.com/processone/ejabberd/issues

## SEE ALSO
Default configuration file: https://github.com/processone/ejabberd/blob/21.12/ejabberd.yml.example

Main site: https://ejabberd.im

Documentation: https://docs.ejabberd.im

Configuration Guide: https://docs.ejabberd.im/admin/configuration

Source code: https://github.com/processone/ejabberd

## COPYING
Copyright (c) 2002-2021 ProcessOne.